Moving an eSIM to a new phone
Whether an eSIM moves to a new phone depends on its provider, the devices and their software. Supported carrier lines can transfer between phones, including some Android and iPhone combinations. The travel profiles sold here have a separate restriction: they do not transfer to another device.
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Your carrier eSIM
Follow the current instructions from Apple for iPhone transfers, Google for Android transfers, or Apple for Android-to-iPhone support. If your carrier is not supported, ask it for a new activation method before erasing the old device.
A travel eSIM bought here
The operator says its installed profile is tied to one device and cannot be transferred or reinstalled after deletion. Install it on the phone you will take on the trip. If it is already on the old phone, contact the seller before removing it; moving apps or restoring a backup does not override the provider's restriction. The operator's single-device policy.
For a travel eSIM from another provider, read that provider's transfer and replacement policy. The fact that the new phone supports eSIM is only one part of the answer.
Before you reset or hand over the old phone
Complete any supported transfer and check the new line works first. On iPhone, erasing content and settings offers a choice to keep or remove eSIMs. Keep a profile only if you are keeping the device and still need that line; remove it before selling or giving away the phone. Apple advises against deleting an eSIM as a troubleshooting step unless the carrier tells you to. Apple's eSIM erasure guidance.