You can recover deleted messages depending on your device and how recently they were deleted. Here are the main methods:

For iPhone (iOS 16 or later)

• Open the Messages app.
• Tap Edit or Filters in the top-left corner of the conversation list.
• Tap Show Recently Deleted.
• Select the conversations or messages you want to recover.
• Tap Recover then Recover Messages.
• Messages deleted within the last 30 days can be restored this way. Messages deleted with "Undo Send" or expired audio messages cannot be recovered.
• If you use Messages in iCloud, recovering messages on one device restores them on all your devices signed in with the same Apple ID

If messages were permanently deleted or deleted before iOS 16, you can try restoring from an iCloud or iTunes backup made before deletion, but this will replace current data on your device

For Android

• Some Android phones have a recycle bin in the messaging app where deleted messages can be recovered.
• If not, you can try using third-party Android data recovery software (e.g., FoneLab) by connecting your phone to a computer and scanning for deleted messages.
• Google Messages app may also allow recovery of archived messages

Additional Tips

• Check other synced devices (e.g., Mac, iPad) if messages are still available there.
• Contact your carrier to see if they keep message records, though privacy policies vary.
• Regularly back up your device (locally with encryption or to the cloud) to prevent permanent loss.
• Third-party recovery tools exist but use reputable software and be cautious about security

In summary, for recent deletions on iPhone with iOS 16+, use the built-in "Recently Deleted" feature in Messages. For older or permanent deletions, restoring from backups or using recovery software are the main options. On Android, recovery depends on the phone and app features or third-party tools.