Three quick checks
Use a stable Wi-Fi connection and have the package QR code ready on another screen or in print.
Check Carrier Lock under Settings → General → About; the device must not be carrier-locked.
Keep iOS up to date. Menu labels may vary by iOS version and language.
Step-by-step activation
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Open Add eSIM
Go to Settings → Cellular or Mobile Service and tap Add eSIM.
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Scan the QR code
Choose Use QR Code and scan the code shown on the delivery screen. If the provider supplied manual details, choose Enter Details Manually.
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Add the plan
Complete the on-screen confirmation and label the new line so you can identify it during your trip.
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Select mobile data
Under Cellular Data, select the new eSIM for data. To avoid unintended charges, review Allow Cellular Data Switching and leave it off unless needed.
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Finish arrival settings
Turn on Data Roaming for the new eSIM only if your package instructions require it. Keep data roaming off on your primary line.
Check your connection
Check that the new eSIM is on, selected for mobile data, and has data roaming set as instructed by the package.
If you have no connection, briefly toggle Airplane Mode and then restart the device.
Enter an APN only if the provider supplied a specific value in the delivery instructions.
If a step does not work
Add eSIM is missing
Check the regional variant, carrier lock, and iOS version. If the menu is absent, confirm compatibility with Apple or the seller before buying.
QR code will not scan
Increase screen brightness, show the QR code on another device, or use manual SM-DP+ details if supplied by the provider.
Installed but no internet
Check that the new eSIM is selected for mobile data, data roaming matches the package instructions, and any supplied APN is correct.