Moving chat history between Android and iPhone: what transfers and what does not

Changing platform is easy for photographs and contacts, and awkward for chat history. The reason is structural: each platform's messaging backup lives in that platform's own cloud storage in its own format, and neither service can read the other's. Switching platforms therefore means a direct device-to-device transfer, or nothing.

The rule that catches everyone

The transfer runs into a phone that has not yet been set up with the messaging account. Once the application has been installed and the number verified on the new handset, the window is closed — and the usual advice to restore from cloud backup during setup is exactly the action that closes it. If you have already done that, the only way back is a full factory reset of the new phone and a second attempt from a clean state.

So the order matters more than anything else here:

1. Update the messaging application on the old phone to its current version.
2. Make a local backup on the old phone, regardless of the transfer route, so there is a fallback that does not depend on the transfer succeeding.
3. Set the new phone up to the point where the transfer tool runs, and run it before verifying the number in the messaging application.
4. Only then verify the number, and follow the prompt to restore the transferred history.
5. Keep the old phone intact, with its data, until you have confirmed the new one has everything. This is the step most often skipped and most often regretted.

What comes across and what does not

Text messages, the chat list and attachments held within the recent history generally transfer. Media that has already been cleared from the device, and older attachments that exist only in a cloud backup, generally do not — the transfer moves what is on the phone.

Call history within the application, payment records where the service offers them, and anything tied to the platform's own notification or widget system tend not to survive. Neither does the state of features that are bound to the device rather than the account: linked companion devices usually have to be paired again on the new phone.

Multiple accounts and business variants

A business version of the same application is a separate installation with a separate backup, and its transfer has to be run separately. A phone with two numbers on it, as described in the dual-SIM piece, may have two installations to move, and they do not move together.

Other applications, same problem

Messaging applications that keep history on their own servers — where a new login simply downloads everything — have no problem at all, and it is worth knowing which of your applications work that way before you plan a migration. The ones that store history on the device are the ones that need attention, and they include the platform's own text messaging application, whose contents are commonly the last thing anyone thinks of and are carried by the platform migration tool only if that tool is run during setup.

Two-factor authentication applications deserve a separate paragraph, because losing them is the most damaging possible outcome of a careless migration. Codes are generated from a secret stored on the device. Some authenticators support an account-based export; others do not, and require you to disable and re-enable two-factor authentication on each service individually. Do that before you wipe the old phone, not after, and keep the recovery codes somewhere that is not the phone.

Before you wipe the old phone

• Open the new phone's messaging application and scroll back a long way in three or four conversations, checking that attachments open rather than only that the text is there.
• Confirm two-factor codes work on the new device for every service you have moved.
• Sign out of the account on the old phone and remove the account from it, which also clears the activation lock that would otherwise make the old device useless to anyone you sell it to.
• Only then factory reset it — and if you intend to sell it, read the IMEI piece from the other side: the checks a buyer will run are the ones you want to pass.

The final note is about photographs, which usually transfer without trouble but sometimes arrive looking different from the originals. That is a separate mechanism, covered in the piece on how images are re-encoded.