On current versions of iOS, deleted Messages conversations can remain in Recently Deleted for about 30 days, giving you a chance to restore them.
Steps
- Open Messages.
- Open the conversation-list options and choose Recently Deleted.
- Select the deleted conversation you want back.
- Tap Recover, then confirm.
If the conversation has aged out of Recently Deleted, it cannot be recovered with this feature. An older backup may contain earlier message data, but restoring a backup can replace information currently on the phone.
Check Recently Deleted promptly because recovery is time-limited. If Messages in iCloud is enabled, message changes can synchronize across devices signed in to the same Apple Account.
If the menu looks slightly different on your iPhone, use Settings search to find the named feature because labels can vary by iOS version.