Check the “Recently Deleted” or “Trash” folder in your Messages app (if available)
Restore from a Google One backup (Android) or iCloud backup (iPhone)
Turn on and use Google Messages backup (Android) or iCloud Messages (iPhone) for future recovery
Restore from a device backup made before the deletion (via computer backup tools)
Contact your mobile carrier to ask whether they store SMS for a limited period
Check any third-party backup/sync apps you previously used for SMS
Use the carrier’s or device’s logs only if you still have access to them (no guaranteed SMS recovery)
If you use dual SIM/eSIM, confirm the correct SIM line and messaging app account
Avoid factory resets until you attempt recovery from backups
If you need help, provide your device model and OS version (Android/iPhone) and the time since deletion