How to Set Up an International eSIM【iPhone/Android】Setup Guide

An eSIM is a digital SIM embedded in your phone that stores mobile plans as data instead of using a physical card. There's no need to swap physical SIM cards—you can set up an eSIM by scanning a QR code. While setting up an international eSIM may seem complex, the process is straightforward: "① Purchase → ② Install before departure → ③ Activate when you arrive." Most plans can be installed before you travel on Wi-Fi, then activated locally once you arrive—keeping you worry-free. Setup typically takes just a few minutes, and knowing what to watch for helps you stay calm if something goes wrong. This guide walks you through setup on both iPhone and Android, plus common issues you might encounter.

eSIM Setup Overview: From Purchase to Activation

International eSIM setup breaks down into three main steps. Understanding the full flow upfront helps you stay on track, and following the order is key to avoiding problems.

Step	Timing	Action
① Purchase	Before departure	Choose a plan for your destination, data needs, and travel duration. Receive your QR code and setup details.
② Install	Before departure (on Wi-Fi at home)	Scan the QR code and register your eSIM on your phone.
③ Activate	After arriving at your destination	Turn on your eSIM and enable data roaming to start using it.

The key is to install (②) on Wi-Fi before you travel, then activate (③) once you arrive. Activation timing and how your plan duration begins may vary—check your purchase confirmation for details. To learn more about eSIM basics, see our eSIM guide articles.

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Get Ready Before Setup

Check these three things before your trip to make setup smooth. Once you've confirmed these, the rest is just following the steps.

Your device supports eSIM

Not every phone supports eSIM. iPhones XS / XR and later generally support it. One quick check: go to iPhone Settings → General → About and look for "Physical SIM" and "eSIM" options. You can find detailed device compatibility at our eSIM-compatible devices page.

Your phone is SIM-unlocked

Devices purchased from carriers often come with SIM locks. To use an international eSIM, your phone typically needs to be SIM-unlocked. Newer phones usually come SIM-free, but if you have an older or used device, contact your carrier at home to request a SIM unlock.

You have stable Wi-Fi access

eSIM installation requires an internet connection. Set up in a stable Wi-Fi environment like home, and make sure your phone's OS (iOS or Android) is up to date. This reduces the chance of problems during setup.

Setting Up eSIM on iPhone

On iPhone, QR code setup is the standard method. The steps below are general—menu names may vary slightly depending on your iOS version.

1. Open Settings → Cellular (or "Mobile Service").
2. Tap "Add Cellular Plan" or "Add eSIM."
3. Scan the QR code you received with your camera (you can also enter details manually if scanning doesn't work).
4. Follow the prompts and tap "Continue," then give your new line a clear name (for example, "Travel").
5. Once you arrive, turn on your new eSIM line and enable "Data Roaming."

Your QR code is typically available via email or your account dashboard. With Bloomy, after purchase you can view your QR code and check your remaining data in your account dashboard.

Can't scan the QR code?

You can enter your details manually: use "Enter Cellular Plan Details" and input the SM-DP+ address and activation code. This info is in your purchase confirmation. If the QR code is displayed on your iPhone's own screen and won't scan, try using another device's screen, a printed copy, or just enter the details manually.

Switching to your eSIM after you arrive

Once you're there, go to Settings → Cellular, turn on your new eSIM line, then enable "Data Roaming." Next, in "Cellular Data," switch to your travel eSIM for data. Your primary home line stays active—you won't lose access to your home number. By switching only data to the travel eSIM, you stay connected abroad. APN settings usually activate automatically, but if your setup guide includes APN details, enter them in "Cellular Data Network."

Setting Up eSIM on Android

Android menu names vary by manufacturer, but the basic flow is the same.

1. Open Settings → Network & Internet → SIM or Mobile Network.
2. Select "Add SIM" or tap the "+" icon, then choose "Download eSIM."
3. Scan your QR code and follow the on-screen prompts to register.
4. Turn on your new eSIM.
5. Once you arrive, enable "Data Roaming" to start using data.

If you can't find the menu, use the Settings search bar and search for "eSIM" or "SIM" to locate it quickly. For more detailed steps, check our setup guide.

Common Issues and Important Notes

Activation timing

Depending on your plan, usage duration may start counting from the moment you activate. If you activate too early before departure, you'll have fewer days of service once you arrive. Always check the timing guidelines in your purchase confirmation.

Enabling data roaming

Most international eSIMs require "Data Roaming" to be turned on. If it's off, you won't connect. This is the most common mistake.

Data-only service

Most international eSIMs, including Bloomy's, are data-only. They don't support voice calls or SMS to phone numbers. If you need a phone number for calls or SMS verification, keep your primary home line, use a local SIM, or get a plan with a phone number. For services requiring SMS verification, set up an alternative verification method beforehand. However, WhatsApp and similar data-based messaging apps work fine over data. Learn more about phone numbers and SMS in our phone numbers and SMS guide.

QR codes usually can't be reused

Once an eSIM QR code is used for setup, it can't typically be used again. Be careful when deleting profiles—if you delete by mistake, you may not be able to reinstall. Only delete if necessary.

Notes on Unlimited Plans

Setup steps are the same for unlimited plans, but remember that "unlimited" doesn't always mean truly unlimited. Some plans include a fair usage policy or speed limits after a certain threshold. Tethering (sharing to other devices) may also vary by plan. If you want to use data worry-free for long periods, check the details for Bloomy Unlimited Max. Review the latest terms before purchase for peace of mind.

No Connection After Setup? Troubleshoot Here

Don't worry if you're not connecting. Check these items in order:

• Is your new eSIM line turned "on"?
• Is "Data Roaming" enabled? (This is the most common issue)
• Is "Cellular Data" set to use your eSIM?
• Is Airplane Mode off? Try toggling it on and off to reconnect.
• Have you tried restarting your phone?
• Is your activation date correct and has it passed?
• On iPhone, try Settings → General → Transfer or Reset iPhone → Reset → Reset Network Settings.

Still stuck? Visit our troubleshooting guide for detailed steps, or contact support.

Setup and Support with Bloomy

Bloomy provides clear, beginner-friendly setup guidance so you won't get lost. After purchase, check your plan details, QR code, and remaining data anytime in your account dashboard. Looking for the right plan? Use our eSIM comparison page to filter by destination, data amount, and duration. Review our setup guide for step-by-step help, check our FAQ for terms and details, and explore our eSIM guide articles to learn more about how eSIMs work.

※ Plan terms, supported devices, and conditions may change. Check the latest details before purchasing. Note: International eSIMs provide data-only connectivity; actual speed and availability depend on local networks, your device, and coverage in your area.