Check your phone’s trash, recently deleted, or archived messages folder
Restore from a cloud backup if you have one
Restore from a device backup made before the messages were deleted
Use your carrier’s message backup or message recovery service if available
Use a trusted data recovery tool compatible with your phone
Stop using the phone immediately to reduce the chance of overwritten data
Ask the sender to resend the messages
Check linked devices or messaging apps that may still have the SMS copies
Contact your phone manufacturer or carrier support for recovery options