The answer is unfortunately: it depends! If you have a backup of the iPhone made before the messages were deleted (either iCloud or made in iTunes on your computer), you can either get the messages out of that backup, or restore the backup to get the messages for sure. Keep in mind that restoring a backup is going to erase the new contents on your iPhone though, so that may not be what you want to do.
If you don't have a backup made before the messages were deleted, there's still a chance that the messages are recoverable. When you delete a message in Messages, the database entry gets tagged for reuse, rather than obliterated - there's a lot of third party tools that will analyze a text message database from an iTunes backup to see if the message record is still there in the database to read. I'm the developer for one of the third party tools - Decipher TextMessage - that will do the analysis on Message app databases in a backup. You can definitely google around to see your options for tools though.
Generally, there are 3 solutions:
- Restore your device from a backup in iCloud or iTunes if the messages existed when the backup was created. The restore needs to erase all the settings and content on your iPhone, so think twice before you decide to restore the phone.
- Extract the messages from the backup with an iTunes/iCloud backup extractor if you don’t want to lose the data generated after the backup.
- Recover deleted text messages directly from the device with a third-party program if no iTunes or iCloud backup was created.
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And iOS 11 will backup to cloud anyway. Messages won't be kept on phone.
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To recover deleted text messages on iPhone 7, first check if there is a backup on iTunes or iCloud. If yes, you can easily recover from backup files. About the details, you can check online. And if there is no backup, make sure the deleted text messages are not overwritten. Then find a pro iOS Data Recovery software to get them back. It's not difficult at all.