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Why are the messages sent by Apple mobile phone sharks a bunch of random codes?

Restore all settings.

Try to restart the phone. 1. Put the SIM card of the mobile phone in another machine, observe whether the same problem will occur, and rule out whether it is related to the SIM card binding service. 2. If you only send SMS automatically in this mobile phone, please back up the data (contacts, information, pictures, etc. ) and try to restore the machine to factory settings.

Update iOS to the latest version and add patches in time.