{"id":504,"date":"2025-08-22T16:05:24","date_gmt":"2025-08-22T07:05:24","guid":{"rendered":"https:\/\/japanconnect-esim.store\/best-esim-japan\/?p=504"},"modified":"2025-08-22T16:05:24","modified_gmt":"2025-08-22T07:05:24","slug":"how-to-use-esim","status":"publish","type":"post","link":"https:\/\/japanconnect-esim.store\/best-esim-japan\/how-to-use-esim\/","title":{"rendered":"How to Use eSIM for Japan: Illustrated Guide on Switching and Timing for International Travel"},"content":{"rendered":"<p>In recent years, awareness of eSIM has grown rapidly, and eSIM services for international travel have become increasingly popular.<\/p>\n<p>If you are reading this, you may be considering how to use eSIM for Japan travel, or perhaps you have already purchased an eSIM data plan.<\/p>\n<p>This time, we will explain <strong><span style=\"color: #ff0000;\">how to use eSIM for Japan, including the right timing for switching, setup methods, and important tips<\/span><\/strong>!<\/p>\n<p>&nbsp;<\/p>\n<div class=\"writer-profile-card\">\n<div class=\"wp-left\">\n<div class=\"wp-label\">Writer Introduction<\/div>\n<div class=\"wp-img\"><img decoding=\"async\" class=\"alignnone size-thumbnail wp-image-10250\" src=\"https:\/\/japanconnect-esim.store\/blog\/wp-content\/uploads\/2024\/09\/writer_icon_esim-portal.jpg\" alt=\"Profile Image\" width=\"150\" height=\"150\" \/><\/div>\n<p class=\"wp-name\">Koki Abe<\/p>\n<p class=\"wp-job\">eSIM Portal Administrator<\/p>\n<\/div>\n<div class=\"wp-right\">\n<div class=\"ul-center\">\n<ul class=\"no-bullet\">\n<li class=\"li-point\">Operates travel eSIM store for international travelers<\/li>\n<li class=\"li-point\">8 years of sales experience in telecommunications (mobile, fiber optic)<\/li>\n<li class=\"li-point\">Backpacker who traveled to 16 countries worldwide<\/li>\n<li class=\"li-point\">Shares insights on eSIM benefits discovered during travels<\/li>\n<\/ul>\n<\/div>\n<div class=\"ul-center\">\n<ul class=\"no-bullet\">\n<li style=\"list-style-type: none;\">\n<ul class=\"no-bullet\">\n<li><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<ul class=\"no-bullet\">\n<li><a href=\"https:\/\/www.linkedin.com\/in\/koki-abe-beaconlink\/\" target=\"_blank\" rel=\"noopener\"><img decoding=\"async\" class=\"wp-image-10306 alignnone\" src=\"https:\/\/mysmartphonelives.com\/wp-content\/uploads\/2023\/10\/\u30ea\u30f3\u30af\u30ed\u30b4-150x150.jpg\" alt=\"\" width=\"20\" height=\"20\" \/><\/a>\u3000<a href=\"https:\/\/twitter.com\/Kokiabe0434\" target=\"_blank\" rel=\"noopener\"><img decoding=\"async\" class=\"wp-image-10307 alignnone\" src=\"https:\/\/mysmartphonelives.com\/wp-content\/uploads\/2023\/10\/x\u30ed\u30b4-1-150x150.jpg\" alt=\"\" width=\"20\" height=\"20\" \/><\/a><\/li>\n<\/ul>\n<\/div>\n<\/div>\n<\/div>\n<p>&nbsp;<\/p>\n<h2><a id=\"eSIM\u5207\u308a\u66ff\u3048\"><\/a>How to Use eSIM for Japan Travel: Switching Methods and Timing<\/h2>\n<p>Let\u2019s get started by explaining the <strong>eSIM switching process when traveling to Japan, from your home country to the airport in Japan<\/strong>.<\/p>\n<p>To help you understand clearly, we will show the step-by-step flow with illustrations so you know the best timing for switching your eSIM during your trip.<\/p>\n<p>&nbsp;<\/p>\n<h3>Best Timing to Switch to Your Japan eSIM<\/h3>\n<p><img decoding=\"async\" class=\"aligncenter size-full wp-image-509\" src=\"http:\/\/japanconnect-esim.store\/best-esim-japan\/wp-content\/uploads\/2025\/08\/When-to-switch-eSIM.png\" alt=\"When to switch eSIM\" width=\"830\" height=\"450\" srcset=\"https:\/\/japanconnect-esim.store\/best-esim-japan\/wp-content\/uploads\/2025\/08\/When-to-switch-eSIM.png 830w, https:\/\/japanconnect-esim.store\/best-esim-japan\/wp-content\/uploads\/2025\/08\/When-to-switch-eSIM-300x163.png 300w, https:\/\/japanconnect-esim.store\/best-esim-japan\/wp-content\/uploads\/2025\/08\/When-to-switch-eSIM-768x416.png 768w\" sizes=\"(max-width: 830px) 100vw, 830px\" \/><\/p>\n<p>The timing for switching to your eSIM for Japan travel follows these steps:<\/p>\n<div class=\"st-mybox  has-title st-mybox-class\" style=\"background:#ffffff;border-color:#ccc;border-width:2px;border-radius:2px;margin: 25px 0 25px 0;\"><p class=\"st-mybox-title\" style=\"color:#757575;font-weight:bold;background: #ffffff;\">eSIM Switching Timing for Japan Travel<\/p><div class=\"st-in-mybox\">\n<ol>\n<li><strong><span style=\"font-size: 90%;\">\u3010While in your home country\u3011Install (activate) the purchased eSIM for Japan travel<\/span><\/strong><\/li>\n<li><strong><span style=\"font-size: 90%;\">\u3010At your home country\u2019s airport\u3011Switch your phone to Airplane Mode and turn off mobile data on your regular SIM<\/span><\/strong><\/li>\n<li><strong><span style=\"font-size: 90%;\">\u3010In Japan\u3011Turn ON mobile data for your Japan eSIM (enable data roaming if necessary)<\/span><\/strong><\/li>\n<\/ol>\n<\/div><\/div>\n<p>Let\u2019s go through each step in detail.<\/p>\n<p>&nbsp;<\/p>\n<h3>STEP 1 | Install (Activate) Your eSIM in Your Home Country<\/h3>\n<p>First, install (activate) the eSIM you purchased for Japan travel while you are still in your home country. There are three main methods of eSIM installation:<\/p>\n<table style=\"border-collapse: collapse; width: 100%; height: 72px;\">\n<tbody>\n<tr style=\"height: 18px;\">\n<td style=\"width: 33.3333%; height: 18px; vertical-align: middle;\"><\/td>\n<td style=\"width: 33.3333%; height: 18px; vertical-align: middle;\"><strong><span style=\"font-size: 90%;\">Advantages<\/span><\/strong><\/td>\n<td style=\"width: 33.3333%; height: 18px; vertical-align: middle;\"><strong><span style=\"font-size: 90%;\">Disadvantages<\/span><\/strong><\/td>\n<\/tr>\n<tr style=\"height: 18px;\">\n<td style=\"width: 33.3333%; height: 18px; vertical-align: middle;\"><strong><span style=\"font-size: 90%;\">Install via QR Code<\/span><\/strong><\/td>\n<td style=\"width: 33.3333%; height: 18px; vertical-align: middle;\"><span style=\"font-size: 90%;\">Quick and simple installation<\/span><\/td>\n<td style=\"width: 33.3333%; height: 18px; vertical-align: middle;\"><span style=\"font-size: 90%;\">Requires showing the QR code on another device or printing it in advance<\/span><\/td>\n<\/tr>\n<tr style=\"height: 18px;\">\n<td style=\"width: 33.3333%; height: 18px; vertical-align: middle;\"><strong><span style=\"font-size: 90%;\">Install via Activation Code<\/span><\/strong><\/td>\n<td style=\"width: 33.3333%; height: 18px; vertical-align: middle;\"><span style=\"font-size: 90%;\">Can be completed entirely on a single smartphone<\/span><\/td>\n<td style=\"width: 33.3333%; height: 18px; vertical-align: middle;\"><span style=\"font-size: 90%;\">Copying and pasting the code can be a little inconvenient<\/span><\/td>\n<\/tr>\n<tr style=\"height: 18px;\">\n<td style=\"width: 33.3333%; height: 18px; vertical-align: middle;\"><strong><span style=\"font-size: 90%;\">Install Directly from an App<\/span><\/strong><\/td>\n<td style=\"width: 33.3333%; height: 18px; vertical-align: middle;\"><span style=\"font-size: 90%;\">Fast and convenient setup<\/span><\/td>\n<td style=\"width: 33.3333%; height: 18px; vertical-align: middle;\"><span style=\"font-size: 90%;\">Only supported by certain eSIM providers (e.g., Airalo, Soracom Mobile)<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>For each installation method, refer to the official website or the tutorials provided by the carrier\u2019s dedicated app.<br \/>\n<strong><span style=\"color: #ff0000;\">Always install your eSIM in a stable internet environment (a Wi-Fi connection is strongly recommended)<\/span><\/strong>.<\/p>\n<p>Below, we will explain how to install your eSIM for Japan using a QR code.<\/p>\n<p>&nbsp;<\/p>\n<h4><a id=\"i\"><\/a>Install eSIM with a QR Code Using Two Smartphones | iOS Method<\/h4>\n<div class=\"arconix-toggle-wrap\"><div class=\"arconix-toggle-title toggle-closed\"><i class='fa fa-plus-square'><\/i>How to Install eSIM with a QR Code on iPhone<\/div><div class=\"arconix-toggle-content\">\n<table style=\"border-collapse: collapse; width: 100%;\">\n<tbody>\n<tr>\n<td style=\"width: 100%; text-align: center;\"><img decoding=\"async\" class=\"aligncenter wp-image-513 size-full\" src=\"http:\/\/japanconnect-esim.store\/best-esim-japan\/wp-content\/uploads\/2025\/08\/iPhone\u3000iOS16\u4ee5\u524d-e1755302909692.png\" alt=\"iPhones Before iOS16\" width=\"750\" height=\"768\" srcset=\"https:\/\/japanconnect-esim.store\/best-esim-japan\/wp-content\/uploads\/2025\/08\/iPhone\u3000iOS16\u4ee5\u524d-e1755302909692.png 750w, https:\/\/japanconnect-esim.store\/best-esim-japan\/wp-content\/uploads\/2025\/08\/iPhone\u3000iOS16\u4ee5\u524d-e1755302909692-293x300.png 293w\" sizes=\"(max-width: 750px) 100vw, 750px\" \/><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 100%; text-align: center;\"><span style=\"font-size: 90%;\">Go to <span class=\"ymarker\">Settings \u2192 Mobile Service<\/span>\u00a0and tap <span class=\"ymarker\">Add eSIM<\/span>.<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>&nbsp;<\/p>\n<table style=\"border-collapse: collapse; width: 100%;\">\n<tbody>\n<tr>\n<td style=\"width: 100%; text-align: center;\"><img decoding=\"async\" class=\"aligncenter wp-image-512 size-full\" src=\"http:\/\/japanconnect-esim.store\/best-esim-japan\/wp-content\/uploads\/2025\/08\/QRcode-e1755302869858.png\" alt=\"QRcode\" width=\"758\" height=\"768\" srcset=\"https:\/\/japanconnect-esim.store\/best-esim-japan\/wp-content\/uploads\/2025\/08\/QRcode-e1755302869858.png 758w, https:\/\/japanconnect-esim.store\/best-esim-japan\/wp-content\/uploads\/2025\/08\/QRcode-e1755302869858-296x300.png 296w, https:\/\/japanconnect-esim.store\/best-esim-japan\/wp-content\/uploads\/2025\/08\/QRcode-e1755302869858-100x100.png 100w\" sizes=\"(max-width: 758px) 100vw, 758px\" \/><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 100%; text-align: center;\"><span style=\"font-size: 90%;\">Select <span class=\"ymarker\">Use QR Code<\/span> and scan the <span class=\"ymarker\">QR code<\/span> displayed on your other device.<br \/>\nScan the QR code displayed on the other device with your iPhone.<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>&nbsp;<\/p>\n<table style=\"border-collapse: collapse; width: 100%;\">\n<tbody>\n<tr>\n<td style=\"width: 100%;\"><img decoding=\"async\" class=\"aligncenter wp-image-514 size-full\" src=\"http:\/\/japanconnect-esim.store\/best-esim-japan\/wp-content\/uploads\/2025\/08\/esim-how-to_2-e1755240390208.png\" alt=\"Install eSIM\" width=\"424\" height=\"768\" srcset=\"https:\/\/japanconnect-esim.store\/best-esim-japan\/wp-content\/uploads\/2025\/08\/esim-how-to_2-e1755240390208.png 424w, https:\/\/japanconnect-esim.store\/best-esim-japan\/wp-content\/uploads\/2025\/08\/esim-how-to_2-e1755240390208-166x300.png 166w\" sizes=\"(max-width: 424px) 100vw, 424px\" \/><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 100%; text-align: center;\">Once activation is complete, your screen will show \u201cMobile Data Setup Complete.\u201d<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div><\/div>\n<p>*Note: The exact steps for installing an eSIM with a QR code may vary depending on your iOS version. For more details, please check the <a href=\"#iOS\">FAQ section<\/a> in this article.*<\/p>\n<p>&nbsp;<\/p>\n<h3>STEP 2 | Turn ON Airplane Mode During the Flight &amp; Turn OFF Mobile Data on Your Regular SIM<\/h3>\n<p>When departing from your home country\u2019s airport, make sure to switch your smartphone to Airplane Mode. This is required by aviation law (Article 164) for carrying electronic devices on board.<\/p>\n<p>Follow these steps to enable Airplane Mode:<\/p>\n<table style=\"border-collapse: collapse; width: 100%;\">\n<tbody>\n<tr>\n<td style=\"width: 100%;\"><img decoding=\"async\" class=\"aligncenter wp-image-521 size-full\" src=\"http:\/\/japanconnect-esim.store\/best-esim-japan\/wp-content\/uploads\/2025\/08\/iPhone\u3000airplane-mode-e1755303049382.png\" alt=\"iPhone\u3000airplane mode\" width=\"747\" height=\"768\" srcset=\"https:\/\/japanconnect-esim.store\/best-esim-japan\/wp-content\/uploads\/2025\/08\/iPhone\u3000airplane-mode-e1755303049382.png 747w, https:\/\/japanconnect-esim.store\/best-esim-japan\/wp-content\/uploads\/2025\/08\/iPhone\u3000airplane-mode-e1755303049382-292x300.png 292w\" sizes=\"(max-width: 747px) 100vw, 747px\" \/><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 100%; text-align: center;\">From the Settings app, toggle the switch to turn ON Airplane Mode. (The example above shows iPhone, but the steps are almost the same on Android.)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>&nbsp;<\/p>\n<p>Next, when you arrive in Japan, <strong>turn OFF mobile data (data roaming) on your home-country SIM<\/strong>.<br \/>\nIf data roaming remains ON, you may be charged expensive international roaming fees. To avoid this, make sure to disable mobile data before landing in Japan.<\/p>\n<p>Here is how to turn off mobile data step by step.<\/p>\n<p>&nbsp;<\/p>\n<h4>How to Turn Off Mobile Data on iPhone<\/h4>\n<table style=\"border-collapse: collapse; width: 100%;\">\n<tbody>\n<tr>\n<td style=\"width: 100%;\"><img decoding=\"async\" class=\"aligncenter size-large wp-image-523\" src=\"http:\/\/japanconnect-esim.store\/best-esim-japan\/wp-content\/uploads\/2025\/08\/iPhone-turn-off-eSIM-1024x744.png\" alt=\"iPhone turn off eSIM\" width=\"920\" height=\"668\" srcset=\"https:\/\/japanconnect-esim.store\/best-esim-japan\/wp-content\/uploads\/2025\/08\/iPhone-turn-off-eSIM-1024x744.png 1024w, https:\/\/japanconnect-esim.store\/best-esim-japan\/wp-content\/uploads\/2025\/08\/iPhone-turn-off-eSIM-300x218.png 300w, https:\/\/japanconnect-esim.store\/best-esim-japan\/wp-content\/uploads\/2025\/08\/iPhone-turn-off-eSIM-768x558.png 768w, https:\/\/japanconnect-esim.store\/best-esim-japan\/wp-content\/uploads\/2025\/08\/iPhone-turn-off-eSIM.png 1060w\" sizes=\"(max-width: 920px) 100vw, 920px\" \/><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 100%; text-align: center;\">From <em>Settings<\/em>, go to <strong>Cellular<\/strong> \u2192 select your home-country line and switch <strong><span style=\"color: #ff0000;\">Turn On This Line<\/span><\/strong> to <strong><span style=\"color: #ff0000;\">Off<\/span><\/strong>. Also, make sure to set <strong><span style=\"color: #ff0000;\">Data Roaming<\/span><\/strong> to <strong><span style=\"color: #ff0000;\">Off<\/span><\/strong>.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>&nbsp;<\/p>\n<h4>How to Turn Off Mobile Data on Android<\/h4>\n<table style=\"border-collapse: collapse; width: 100%;\">\n<tbody>\n<tr>\n<td style=\"width: 100%;\"><img decoding=\"async\" class=\"aligncenter size-full wp-image-525\" src=\"http:\/\/japanconnect-esim.store\/best-esim-japan\/wp-content\/uploads\/2025\/08\/Android-SIM-off\u2460-e1755308510279.png\" alt=\"\" width=\"707\" height=\"768\" srcset=\"https:\/\/japanconnect-esim.store\/best-esim-japan\/wp-content\/uploads\/2025\/08\/Android-SIM-off\u2460-e1755308510279.png 707w, https:\/\/japanconnect-esim.store\/best-esim-japan\/wp-content\/uploads\/2025\/08\/Android-SIM-off\u2460-e1755308510279-276x300.png 276w\" sizes=\"(max-width: 707px) 100vw, 707px\" \/><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 100%; text-align: center;\">From <em>Settings<\/em>, go to <span class=\"ymarker\">Network &amp; Internet<\/span> \u2192 <span class=\"ymarker\">SIM<\/span>.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>&nbsp;<\/p>\n<table style=\"border-collapse: collapse; width: 100%;\">\n<tbody>\n<tr>\n<td style=\"width: 100%;\"><img decoding=\"async\" class=\"aligncenter wp-image-527 size-full\" src=\"http:\/\/japanconnect-esim.store\/best-esim-japan\/wp-content\/uploads\/2025\/08\/Android-SIM-off\u2461-e1755309355923.png\" alt=\"\" width=\"700\" height=\"768\" srcset=\"https:\/\/japanconnect-esim.store\/best-esim-japan\/wp-content\/uploads\/2025\/08\/Android-SIM-off\u2461-e1755309355923.png 700w, https:\/\/japanconnect-esim.store\/best-esim-japan\/wp-content\/uploads\/2025\/08\/Android-SIM-off\u2461-e1755309355923-273x300.png 273w\" sizes=\"(max-width: 700px) 100vw, 700px\" \/><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 100%; text-align: center;\">Switch <strong><span style=\"color: #ff0000;\">Use SIM<\/span><\/strong> to <strong><span style=\"color: #ff0000;\">Off<\/span><\/strong>.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>&nbsp;<\/p>\n<h3>STEP3 | Turn On Mobile Data Upon Arriving at a Japanese Airport<\/h3>\n<p>Once you arrive at a Japanese airport, connect to the internet using your Japan travel eSIM. Follow the steps below to turn on mobile data for your eSIM.<\/p>\n<p>&nbsp;<\/p>\n<h4>How to Turn On eSIM Mobile Data on iPhone<\/h4>\n<table style=\"border-collapse: collapse; width: 100%;\">\n<tbody>\n<tr>\n<td style=\"width: 100%;\"><img decoding=\"async\" class=\"aligncenter size-full wp-image-531\" src=\"http:\/\/japanconnect-esim.store\/best-esim-japan\/wp-content\/uploads\/2025\/08\/iPhone-turn-on-eSIM.png\" alt=\"iPhone turn on eSIM\" width=\"1060\" height=\"770\" srcset=\"https:\/\/japanconnect-esim.store\/best-esim-japan\/wp-content\/uploads\/2025\/08\/iPhone-turn-on-eSIM.png 1060w, https:\/\/japanconnect-esim.store\/best-esim-japan\/wp-content\/uploads\/2025\/08\/iPhone-turn-on-eSIM-300x218.png 300w, https:\/\/japanconnect-esim.store\/best-esim-japan\/wp-content\/uploads\/2025\/08\/iPhone-turn-on-eSIM-1024x744.png 1024w, https:\/\/japanconnect-esim.store\/best-esim-japan\/wp-content\/uploads\/2025\/08\/iPhone-turn-on-eSIM-768x558.png 768w\" sizes=\"(max-width: 1060px) 100vw, 1060px\" \/><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 100%; text-align: center;\">Go to <strong>Mobile Service<\/strong>\u00a0\u2192 select your <strong>Travel eSIM<\/strong> \u2192 toggle <span class=\"ymarker\">\u201cTurn On This Line\u201d<\/span> to ON.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>&nbsp;<\/p>\n<h4>How to Turn On eSIM Mobile Data on Android<\/h4>\n<table style=\"border-collapse: collapse; width: 100%;\">\n<tbody>\n<tr>\n<td style=\"width: 100%;\"><img decoding=\"async\" class=\"aligncenter size-full wp-image-535\" src=\"http:\/\/japanconnect-esim.store\/best-esim-japan\/wp-content\/uploads\/2025\/08\/Android-SIM-on\u2460.png\" alt=\"Android SIM on\" width=\"1060\" height=\"770\" srcset=\"https:\/\/japanconnect-esim.store\/best-esim-japan\/wp-content\/uploads\/2025\/08\/Android-SIM-on\u2460.png 1060w, https:\/\/japanconnect-esim.store\/best-esim-japan\/wp-content\/uploads\/2025\/08\/Android-SIM-on\u2460-300x218.png 300w, https:\/\/japanconnect-esim.store\/best-esim-japan\/wp-content\/uploads\/2025\/08\/Android-SIM-on\u2460-1024x744.png 1024w, https:\/\/japanconnect-esim.store\/best-esim-japan\/wp-content\/uploads\/2025\/08\/Android-SIM-on\u2460-768x558.png 768w\" sizes=\"(max-width: 1060px) 100vw, 1060px\" \/><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 100%; text-align: center;\">Go to <strong>Network and Internet<\/strong> \u2192 <strong>SIMs<\/strong> \u2192 select your <span class=\"ymarker\">Japan eSIM<\/span> (in this example, Japan eSIM).<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<table style=\"border-collapse: collapse; width: 100%; height: 100%;\">\n<tbody>\n<tr style=\"height: 100%;\">\n<td style=\"width: 100%; height: 100%;\"><img decoding=\"async\" class=\"aligncenter wp-image-534 size-full\" src=\"http:\/\/japanconnect-esim.store\/best-esim-japan\/wp-content\/uploads\/2025\/08\/Android-SIM-on\u2461-e1755322721319.png\" alt=\"Android SIM on\" width=\"707\" height=\"768\" srcset=\"https:\/\/japanconnect-esim.store\/best-esim-japan\/wp-content\/uploads\/2025\/08\/Android-SIM-on\u2461-e1755322721319.png 707w, https:\/\/japanconnect-esim.store\/best-esim-japan\/wp-content\/uploads\/2025\/08\/Android-SIM-on\u2461-e1755322721319-276x300.png 276w\" sizes=\"(max-width: 707px) 100vw, 707px\" \/><\/td>\n<\/tr>\n<tr style=\"height: 100%;\">\n<td style=\"width: 100%; height: 100%; text-align: center;\">Check <strong>Use SIM<\/strong> to confirm that <span class=\"ymarker-s\">mobile data is ON<\/span>.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>&nbsp;<\/p>\n<h3>Turn ON Data Roaming Depending on Your eSIM Plan<\/h3>\n<p>If your eSIM data plan specifies in the application page or on the voucher (the email you receive with the eSIM QR code after purchase) that <strong>\u201cData Roaming must be turned ON\u201d<\/strong>, then you need to enable Data Roaming.<\/p>\n<p>Follow the steps below to turn ON Data Roaming.<\/p>\n<p>&nbsp;<\/p>\n<h4>How to Turn ON eSIM Data Roaming on iPhone<\/h4>\n<table style=\"border-collapse: collapse; width: 100%;\">\n<tbody>\n<tr>\n<td style=\"width: 100%;\"><img decoding=\"async\" class=\"aligncenter wp-image-533 size-full\" src=\"http:\/\/japanconnect-esim.store\/best-esim-japan\/wp-content\/uploads\/2025\/08\/iPhone-detaroaming-on-e1755322765725.png\" alt=\"iPhone detaroaming on\" width=\"717\" height=\"768\" srcset=\"https:\/\/japanconnect-esim.store\/best-esim-japan\/wp-content\/uploads\/2025\/08\/iPhone-detaroaming-on-e1755322765725.png 717w, https:\/\/japanconnect-esim.store\/best-esim-japan\/wp-content\/uploads\/2025\/08\/iPhone-detaroaming-on-e1755322765725-280x300.png 280w\" sizes=\"(max-width: 717px) 100vw, 717px\" \/><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 100%; text-align: center;\">On the same settings screen where you turned ON mobile data for your eSIM, switch <span class=\"ymarker-s\">Data Roaming<\/span> to ON.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>&nbsp;<\/p>\n<h4>How to Turn ON eSIM Data Roaming on Android<\/h4>\n<table style=\"border-collapse: collapse; width: 100%;\">\n<tbody>\n<tr>\n<td style=\"width: 100%;\"><img decoding=\"async\" class=\"aligncenter wp-image-532 size-full\" src=\"http:\/\/japanconnect-esim.store\/best-esim-japan\/wp-content\/uploads\/2025\/08\/Android-detaroaming-on-e1755322802453.png\" alt=\"\" width=\"715\" height=\"768\" srcset=\"https:\/\/japanconnect-esim.store\/best-esim-japan\/wp-content\/uploads\/2025\/08\/Android-detaroaming-on-e1755322802453.png 715w, https:\/\/japanconnect-esim.store\/best-esim-japan\/wp-content\/uploads\/2025\/08\/Android-detaroaming-on-e1755322802453-279x300.png 279w\" sizes=\"(max-width: 715px) 100vw, 715px\" \/><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 100%; text-align: center;\">On the same settings screen where you turned ON mobile data for your eSIM, switch <span class=\"ymarker-s\">Roaming<\/span> to ON.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>&nbsp;<\/p>\n<div class=\"st-mybox  has-title st-mybox-class\" style=\"background:#ffebee;border-color:#ef9a9a;border-width:2px;border-radius:5px;margin: 25px 0 25px 0;\"><p class=\"st-mybox-title\" style=\"color:#ef5350;font-weight:bold;text-shadow: #fff 3px 0px 0px, #fff 2.83487px 0.981584px 0px, #fff 2.35766px 1.85511px 0px, #fff 1.62091px 2.52441px 0px, #fff 0.705713px 2.91581px 0px, #fff -0.287171px 2.98622px 0px, #fff -1.24844px 2.72789px 0px, #fff -2.07227px 2.16926px 0px, #fff -2.66798px 1.37182px 0px, #fff -2.96998px 0.42336px 0px, #fff -2.94502px -0.571704px 0px, #fff -2.59586px -1.50383px 0px, #fff -1.96093px -2.27041px 0px, #fff -1.11013px -2.78704px 0px, #fff -0.137119px -2.99686px 0px, #fff 0.850987px -2.87677px 0px, #fff 1.74541px -2.43999px 0px, #fff 2.44769px -1.73459px 0px, #fff 2.88051px -0.838246px 0px;background: linear-gradient(0deg,#ffebee 0%,#ffebee 55%,rgba(0,0,0,0) 55%,rgba(0,0,0,0) 100%);\"><i class=\"st-fa st-svg-exclamation-circle st-css-no\" aria-hidden=\"true\"><\/i>APN Settings May Also Be Required<\/p><div class=\"st-in-mybox\">\n<p><span style=\"font-size: 90%; color: #ff0000;\">Depending on the eSIM data plan, APN settings<sup>\u203b<\/sup> may be applied automatically or require manual configuration. If manual APN settings are needed, instructions will be included in the purchase notes or voucher, so please check when purchasing. <a href=\"#APN\u8a2d\u5b9a\">For details on APN settings, please consult the official website of each eSIM service<\/a>.<\/span><\/p>\n<\/div><\/div><br \/>\n<span style=\"font-size: 90%;\">\u203bAPN Settings\u2026Initial setup required to connect your smartphone to the internet<\/span><\/p>\n<p>&nbsp;<\/p>\n<h2><a id=\"1\"><\/a>What is eSIM? An Embedded SIM Explained<\/h2>\n<p><img decoding=\"async\" class=\"aligncenter size-full wp-image-536\" src=\"http:\/\/japanconnect-esim.store\/best-esim-japan\/wp-content\/uploads\/2025\/08\/what-is-an-eSIM.png\" alt=\"what is an eSIM\" width=\"830\" height=\"450\" srcset=\"https:\/\/japanconnect-esim.store\/best-esim-japan\/wp-content\/uploads\/2025\/08\/what-is-an-eSIM.png 830w, https:\/\/japanconnect-esim.store\/best-esim-japan\/wp-content\/uploads\/2025\/08\/what-is-an-eSIM-300x163.png 300w, https:\/\/japanconnect-esim.store\/best-esim-japan\/wp-content\/uploads\/2025\/08\/what-is-an-eSIM-768x416.png 768w\" sizes=\"(max-width: 830px) 100vw, 830px\" \/><\/p>\n<p>eSIM (embedded SIM) stands for an embedded SIM card.<\/p>\n<p>Unlike the traditional <strong>physical SIM card that you insert into your smartphone, an eSIM is a digital SIM that stores all the information needed for mobile connectivity<\/strong>.<\/p>\n<p>In other words, you don\u2019t need to insert a card. Instead, the eSIM is built into your smartphone and activated digitally by the user. This makes <strong>how to use eSIM<\/strong> simple, flexible, and convenient for both domestic use and international travel.<\/p>\n<p>&nbsp;<\/p>\n<h3>A Smartphone Compatible with eSIM is Required<\/h3>\n<p><img decoding=\"async\" class=\"aligncenter size-full wp-image-498\" src=\"http:\/\/japanconnect-esim.store\/best-esim-japan\/wp-content\/uploads\/2025\/08\/eSIM-compatible-device.png\" alt=\"eSIM compatible device\" width=\"830\" height=\"450\" srcset=\"https:\/\/japanconnect-esim.store\/best-esim-japan\/wp-content\/uploads\/2025\/08\/eSIM-compatible-device.png 830w, https:\/\/japanconnect-esim.store\/best-esim-japan\/wp-content\/uploads\/2025\/08\/eSIM-compatible-device-300x163.png 300w, https:\/\/japanconnect-esim.store\/best-esim-japan\/wp-content\/uploads\/2025\/08\/eSIM-compatible-device-768x416.png 768w\" sizes=\"(max-width: 830px) 100vw, 830px\" \/><\/p>\n<p>To connect your smartphone to the internet using eSIM, <span class=\"ymarker-s\">you must first confirm that your device is eSIM-compatible<\/span>.<\/p>\n<p>In addition, <strong><span style=\"color: #ff0000;\">your smartphone must be unlocked (SIM-free)<sup>\u203b<\/sup> in order to use an eSIM<\/span><\/strong>.<\/p>\n<div class=\"st-mybox  has-title st-mybox-class\" style=\"background:#fafafa;border-width:0px;border-radius:5px;margin: 25px 0 25px 0;\"><p class=\"st-mybox-title\" style=\"color:#757575;font-weight:bold;text-shadow: #fff 3px 0px 0px, #fff 2.83487px 0.981584px 0px, #fff 2.35766px 1.85511px 0px, #fff 1.62091px 2.52441px 0px, #fff 0.705713px 2.91581px 0px, #fff -0.287171px 2.98622px 0px, #fff -1.24844px 2.72789px 0px, #fff -2.07227px 2.16926px 0px, #fff -2.66798px 1.37182px 0px, #fff -2.96998px 0.42336px 0px, #fff -2.94502px -0.571704px 0px, #fff -2.59586px -1.50383px 0px, #fff -1.96093px -2.27041px 0px, #fff -1.11013px -2.78704px 0px, #fff -0.137119px -2.99686px 0px, #fff 0.850987px -2.87677px 0px, #fff 1.74541px -2.43999px 0px, #fff 2.44769px -1.73459px 0px, #fff 2.88051px -0.838246px 0px;background: linear-gradient(0deg,#fafafa 0%,#fafafa 55%,rgba(0,0,0,0) 55%,rgba(0,0,0,0) 100%);\"><i class=\"st-fa st-svg-file-text-o st-css-no\" aria-hidden=\"true\"><\/i>Unlocked Smartphones<\/p><div class=\"st-in-mybox\">\n<p><span style=\"font-size: 80%;\">SIM lock is a restriction set by mobile carriers to prevent the use of SIM cards (including eSIMs) from other providers. A smartphone that has had its SIM lock removed is commonly called a SIM-free device. If your phone is locked, you will need to complete the SIM unlock procedure with your carrier before using an eSIM.<\/span><\/p>\n<\/div><\/div>\n<p>If you want to check whether your smartphone supports eSIM, use the following method.<\/p>\n<p>&nbsp;<\/p>\n<h4>How to Check if Your iPhone Supports eSIM<\/h4>\n<table style=\"border-collapse: collapse; width: 100%;\">\n<tbody>\n<tr>\n<td style=\"width: 100%;\"><img decoding=\"async\" class=\"aligncenter size-large wp-image-502\" src=\"http:\/\/japanconnect-esim.store\/best-esim-japan\/wp-content\/uploads\/2025\/08\/iPhone\u3000EID-1024x744.png\" alt=\"iPhone\u3000EID\" width=\"920\" height=\"668\" srcset=\"https:\/\/japanconnect-esim.store\/best-esim-japan\/wp-content\/uploads\/2025\/08\/iPhone\u3000EID-1024x744.png 1024w, https:\/\/japanconnect-esim.store\/best-esim-japan\/wp-content\/uploads\/2025\/08\/iPhone\u3000EID-300x218.png 300w, https:\/\/japanconnect-esim.store\/best-esim-japan\/wp-content\/uploads\/2025\/08\/iPhone\u3000EID-768x558.png 768w, https:\/\/japanconnect-esim.store\/best-esim-japan\/wp-content\/uploads\/2025\/08\/iPhone\u3000EID.png 1060w\" sizes=\"(max-width: 920px) 100vw, 920px\" \/><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 100%; text-align: center;\">Open the Settings app \u2192 <span class=\"ymarker\">\u201cGeneral\u201d<\/span> \u2192 <span class=\"ymarker\">\u201cAbout\u201d<\/span> \u2192 <span class=\"ymarker\">\u201cEID\u201d<\/span>.<br \/>\nIf a 32-digit eSIM identification number is displayed, your iPhone supports eSIM.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>The iPhone 15 sold in the U.S. is already eSIM-only and does not have a SIM slot. It is highly likely that future iPhone models worldwide will all support eSIM.<\/p>\n<p>However, iPhones sold in China do not support eSIM for any model series.<\/p>\n<p>&nbsp;<\/p>\n<h4>How to Check if Your Android Device Supports eSIM<\/h4>\n<table style=\"border-collapse: collapse; width: 100%; height: 100%;\">\n<tbody>\n<tr style=\"height: 100%;\">\n<td style=\"width: 100%; height: 100%;\"><img decoding=\"async\" class=\"aligncenter size-large wp-image-501\" src=\"http:\/\/japanconnect-esim.store\/best-esim-japan\/wp-content\/uploads\/2025\/08\/Android-EID-1024x744.png\" alt=\"Android EID\" width=\"920\" height=\"668\" srcset=\"https:\/\/japanconnect-esim.store\/best-esim-japan\/wp-content\/uploads\/2025\/08\/Android-EID-1024x744.png 1024w, https:\/\/japanconnect-esim.store\/best-esim-japan\/wp-content\/uploads\/2025\/08\/Android-EID-300x218.png 300w, https:\/\/japanconnect-esim.store\/best-esim-japan\/wp-content\/uploads\/2025\/08\/Android-EID-768x558.png 768w, https:\/\/japanconnect-esim.store\/best-esim-japan\/wp-content\/uploads\/2025\/08\/Android-EID.png 1060w\" sizes=\"(max-width: 920px) 100vw, 920px\" \/><\/td>\n<\/tr>\n<tr style=\"height: 18px;\">\n<td style=\"width: 100%; height: 18px; text-align: center;\">The example above shows a Pixel 7pro. Go to <span class=\"ymarker\">\u201cAbout Phone\u201d<\/span> \u2192 <span class=\"ymarker\">\u201cSIM Status\u201d<\/span> \u2192 <span class=\"ymarker\">\u201cEID\u201d<\/span>.<br \/>\nIf a 32-digit eSIM identification number appears, your Android device supports eSIM.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>&nbsp;<\/p>\n<h2><a id=\"2\"><\/a>Benefits of Using an eSIM for Japan Travel<\/h2>\n<p><img decoding=\"async\" class=\"wp-image-11658 aligncenter\" src=\"https:\/\/mysmartphonelives.com\/wp-content\/uploads\/2024\/03\/\u540d\u79f0\u672a\u8a2d\u5b9a\u306e\u30c7\u30b6\u30a4\u30f3-1.jpg\" alt=\"Benefits of using eSIM in Japan\" width=\"761\" height=\"321\" \/><\/p>\n<p>There are three main benefits of using an eSIM when traveling in Japan. Compared to rental Wi-Fi or a traditional physical SIM card, eSIM offers clear advantages.<\/p>\n<div class=\"st-mybox  has-title st-mybox-class\" style=\"background:#ffffff;border-color:#ccc;border-width:2px;border-radius:2px;margin: 25px 0 25px 0;\"><p class=\"st-mybox-title\" style=\"color:#757575;font-weight:bold;background: #ffffff;\">Key Benefits of eSIM<\/p><div class=\"st-in-mybox\">\n<ul>\n<li><strong><span style=\"font-size: 90%;\">Fast activation with minimal setup<\/span><\/strong><\/li>\n<li><strong><span style=\"font-size: 90%;\">No extra device to carry and no risk of losing a SIM card<\/span><\/strong><\/li>\n<li><strong><span style=\"font-size: 90%;\">Easily switch between multiple eSIM plans<\/span><\/strong><\/li>\n<\/ul>\n<\/div><\/div>\n<p>Let\u2019s go through these advantages one by one.<\/p>\n<p>&nbsp;<\/p>\n<h3>Faster Activation Compared to Other Options<\/h3>\n<p>eSIM services for Japan travel can be purchased directly through a website or a dedicated mobile app. The entire process is contactless, allowing you to complete everything from purchase to setup on your own without meeting anyone.<\/p>\n<p><span class=\"ymarker-s\">This means you save time compared to searching for a SIM counter or arranging rental Wi-Fi, making eSIM activation significantly faster.<\/span><\/p>\n<p><strong>The time from purchasing to activating an eSIM can take as little as 5 to 10 minutes.<\/strong><\/p>\n<p>&nbsp;<\/p>\n<h3>No Extra Device to Carry and No Risk of Losing It<\/h3>\n<p>Because an eSIM is installed directly inside your smartphone, there\u2019s no need to insert or swap a physical SIM card.<\/p>\n<p>Unlike rental Wi-Fi, it doesn\u2019t add bulk to your luggage, and there\u2019s no risk of losing a separate device or SIM card.<\/p>\n<p>&nbsp;<\/p>\n<h3>Ability to Switch Between Multiple eSIMs<\/h3>\n<p>With eSIM, you can keep your regular SIM card active while adding multiple eSIM profiles, limited only by your device\u2019s memory.<\/p>\n<p>If you purchase and install eSIMs for multiple countries in advance, <span class=\"ymarker-s\">you can simply switch between them as you travel from country to country and stay connected instantly.<\/span><\/p>\n<p>This is especially convenient for international travelers visiting Japan and other destinations, as you no longer need to buy a new SIM card every time you land in a new country.<\/p>\n<p>&nbsp;<\/p>\n<h2>FAQs<\/h2>\n<p>Here are some frequently asked questions about how to use an eSIM in Japan and how to switch between eSIM plans.<br \/>\nIf you still have questions after reading this article or cannot connect to the internet, please check the FAQs below.<\/p>\n<div class=\"st-mybox  has-title st-mybox-class\" style=\"background:#ffffff;border-color:#ccc;border-width:2px;border-radius:2px;margin: 25px 0 25px 0;\"><p class=\"st-mybox-title\" style=\"color:#757575;font-weight:bold;background: #ffffff;\">FAQs About Using eSIM in Japan<\/p><div class=\"st-in-mybox\">\n<ul>\n<li><span style=\"font-size: 90%;\">What happens if I accidentally turn ON mobile data for my Japan eSIM while still in my home country?<\/span><\/li>\n<li id=\"issue1\"><span style=\"font-size: 90%;\">Error: \u201cUnable to Add Mobile Data Plan from This Carrier\u201d<\/span><\/li>\n<li><span style=\"font-size: 90%;\">Error: \u201cThis eSIM Cannot Be Added (This Code Is No Longer Valid)\u201d<\/span><\/li>\n<li><span style=\"font-size: 90%;\">Does the eSIM installation process differ depending on the iOS version?<\/span><\/li>\n<li><span style=\"font-size: 90%;\">How do I set the APN for my eSIM?<\/span><\/li>\n<li><span style=\"font-size: 90%;\">What should I do with my eSIM settings after returning from Japan?<\/span><\/li>\n<\/ul>\n<\/div><\/div>\n<p>&nbsp;<\/p>\n<h3>What if I Accidentally Turn ON Mobile Data for My Japan eSIM While Still in My Home Country?<\/h3>\n<p>If your eSIM data plan does not include your home country (i.e., it is not a regional or global roaming plan), there is no issue even if you accidentally switch ON mobile data for your Japan eSIM while abroad.<\/p>\n<p>However, to be safe, it is recommended to keep the Japan eSIM\u2019s mobile data switched OFF until you arrive in Japan.<\/p>\n<p>&nbsp;<\/p>\n<h3 id=\"issue1\">Error: \u201cUnable to Add Mobile Data Plan from This Carrier\u201d<\/h3>\n<p id=\"issue1\">If you see the message <em>\u201cUnable to Add Mobile Data Plan from This Carrier\u201d<\/em>, it is possible that your device is locked to a specific carrier (SIM-locked).<\/p>\n<p>In this case, contact the carrier from which you purchased your smartphone and request a SIM unlock procedure. An unlocked (SIM-free) device is required to use an eSIM in Japan.<\/p>\n<p>&nbsp;<\/p>\n<h3>This eSIM Cannot Be Added (This Code Is No Longer Valid)<\/h3>\n<p>If you see the message <em>\u201cThis eSIM cannot be added (This code is no longer valid)\u201d<\/em>, it means that the eSIM code has already been activated.<\/p>\n<p>Remember, an eSIM QR code can only be used once. Check the following three possible reasons:<\/p>\n<div class=\"st-mybox  has-title st-mybox-class\" style=\"background:#ffffff;border-color:#ccc;border-width:2px;border-radius:2px;margin: 25px 0 25px 0;\"><p class=\"st-mybox-title\" style=\"color:#757575;font-weight:bold;background: #ffffff;\">When Your eSIM Code Is No Longer Valid<\/p><div class=\"st-in-mybox\">\n<ul>\n<li><span style=\"font-size: 90%;\">Check your mobile data settings to see if an eSIM plan was already activated with the same QR code.<\/span><\/li>\n<li><span style=\"font-size: 90%;\">You may have started the activation process with the QR code and then canceled it.<\/span><\/li>\n<li><span style=\"font-size: 90%;\">The same eSIM data plan may already be in use on another device.<\/span><\/li>\n<\/ul>\n<\/div><\/div>\n<p>If none of these apply and the issue persists, contact the eSIM provider from whom you purchased the plan for further assistance.<\/p>\n<p>&nbsp;<\/p>\n<h3>Does the Method of Adding an eSIM Differ Depending on the iOS Version?<\/h3>\n<p><a id=\"iOS\"><\/a>Yes, the process of adding an eSIM can vary depending on your iOS version.<\/p>\n<div class=\"st-mybox  has-title st-mybox-class st-title-under st-list-border st-list-circle st-title-border\" style=\"border-color:#f3f3f3;border-width:3px;border-radius:5px;margin: 25px 0 25px 0;\"><p class=\"st-mybox-title\" style=\"color:#757575;font-weight:bold;background: #ffffff;border-bottom-color: #757575\"><i class=\"st-fa st-svg-file-text-o st-css-no\" aria-hidden=\"true\"><\/i>How to Add an eSIM on Different iOS Versions<\/p><div class=\"st-in-mybox\">\n<ul>\n<li><strong>iOS 16 and earlier:<\/strong> You can add an eSIM by scanning a QR code from another device or a printed copy via <em>Settings<\/em> \u2192 <em>Cellular<\/em>.<\/li>\n<li><strong>iOS 17.4:<\/strong> You can scan a QR code saved as an image directly from <em>Settings<\/em> \u2192 <em>Cellular<\/em>.<\/li>\n<li><strong>iOS 18 and later:<\/strong> Apple removed the \u201cScan from Photos\u201d option. Instead, you can long-press a QR code displayed on the screen, and an <em>Add eSIM<\/em> option will appear. <sup>\u203b Note: Some eSIM providers may not support the long-press method, so the iOS 16 method may still be required.<\/sup><\/li>\n<\/ul>\n<\/div><\/div>\n<p>&nbsp;<\/p>\n<h3><a id=\"APN\u8a2d\u5b9a\"><\/a>What Should I Do If My APN Settings Might Be Incorrect?<\/h3>\n<p>APN settings vary depending on your eSIM provider and travel destination.<\/p>\n<p>If you suspect that your APN settings are incorrect, check the help pages provided by your eSIM provider. Below are the links for reference:<\/p>\n<p>\u25c6 APN setup guides for major eSIM services<\/p>\n<p>\u30fbAiralo: <a href=\"https:\/\/www.airalo.com\/help\/en\/getting-started-with-airalo\/E8DFWD88SHUX\/how-do-i-change-my-apn-settings\/O0V0KFU5QNJM\">Help Page<\/a><\/p>\n<p>\u30fbHolafly: <a href=\"https:\/\/esim.holafly.com\/faq\/esim-setup-guide\/apn-setup-holafly-esims\/\">FAQ<\/a><\/p>\n<p>&nbsp;<\/p>\n<h3>What Should I Do with My eSIM Settings After Returning Home?<\/h3>\n<p>After returning from Japan, turn OFF data roaming for your Japan travel eSIM and turn ON mobile data for your home-country SIM.<\/p>\n<p>If the Japan eSIM has expired, you should delete it from your device.<\/p>\n<p>&nbsp;<\/p>\n<h2>Conclusion<\/h2>\n<div class=\"st-blackboard\">\n<p class=\"st-blackboard-title-box\"><span class=\"st-blackboard-title\">Key Takeaways from This Article<\/span><\/p>\n<ul class=\"st-blackboard-list st-no-ck-off\">\n<li><a href=\"#eSIM\u5207\u308a\u66ff\u3048\">How to use eSIM in Japan and the best timing for switching<\/a><\/li>\n<li><a href=\"#1\">What is eSIM? An embedded SIM explained<\/a><\/li>\n<li><a href=\"#2\">Benefits of using eSIM for Japan travel<\/a><\/li>\n<\/ul>\n<\/div>\n<p>In this article, we explained <strong>how to use an eSIM in Japan<\/strong> and when to switch to your Japan eSIM for the smoothest experience.<\/p>\n<p>Make sure to remember the <span class=\"ymarker-s\">steps and timing for switching your eSIM<\/span> so you can enjoy fast and reliable internet during your trip to Japan.<\/p>\n<p><script type=\"application\/ld+json\">\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"Article\",\n  \"mainEntityOfPage\": {\n    \"@type\": \"WebPage\",\n    \"@id\": \"https:\/\/japanconnect-esim.store\/best-esim-japan\/how-to-use-esim\"\n  },\n  \"url\": \"https:\/\/japanconnect-esim.store\/best-esim-japan\/how-to-use-esim\",\n  \"headline\": \"How to Use eSIM for Japan: Illustrated Guide on Switching and Timing for International Travel\",\n  \"description\": \"Step-by-step guide on how to switch eSIM on iPhone and Android for travel in Japan, including timing, setup instructions, and troubleshooting tips.\",\n  \"inLanguage\": \"en\",\n  \"image\": \"https:\/\/japanconnect-esim.store\/best-esim-japan\/wp-content\/uploads\/2025\/08\/esim-switching.png\",\n  \"author\": {\n    \"@type\": \"Person\",\n    \"name\": \"Koki Abe\",\n    \"url\": \"https:\/\/jp.linkedin.com\/in\/koki-abe-beaconlink\"\n  },\n  \"publisher\": {\n    \"@type\": \"Organization\",\n    \"name\": \"BeaconLink LLC\",\n    \"logo\": {\n      \"@type\": \"ImageObject\",\n      \"url\": \"https:\/\/beaconlink.jp\/wp-content\/uploads\/2025\/05\/BeaconLink.logo_.png\"\n    }\n  },\n  \"datePublished\": \"2025-08-17T00:00:00+09:00\",\n  \"dateModified\": \"2025-08-17T00:00:00+09:00\"\n}\n<\/script><\/p>\n<p><script type=\"application\/ld+json\">\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What if I turn on the Japan eSIM mobile data before arriving in Japan?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"If your eSIM data plan does not include your home country, turning on the Japan eSIM mobile data while still in your home country will not cause any issues. As a precaution, keep the Japan eSIM mobile data turned off until you arrive in Japan.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Cannot add a mobile plan from this carrier\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The message 'Cannot add a mobile plan from this carrier' may indicate that your device is SIM-locked. Check with the carrier from which you purchased your smartphone. If your phone is SIM-locked, follow the carrier\u2019s procedure to unlock it.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Cannot add this eSIM (this code is no longer valid)\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"If you see the message 'Cannot add this eSIM (this code is no longer valid),' the eSIM code has already been activated. An eSIM QR code can only be used once. 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