Why did my mobile phone suddenly lose its call record and SMS record, and there was no record of just sending it?

See if it was all stored in the sim card before. There should be a display screen showing the contact points in the settings. Sim cards, mobile phones and everything are on display.

Enter the record (call record)-Click the menu button in the lower left corner-View mode-Select all calls (or select as needed).

Check whether the mobile phone time is correct and punctual.

Check whether there is any space left in the phone.

Back up mobile phone data (phone book, SMS, multimedia files, etc.). ) and restore the factory settings. If the problem of restoring factory settings still exists, it is recommended to send the mobile phone to the nearest service center for testing and further processing.