Why does someone get a short message every day when my mobile phone is turned on and off, which reads: Please keep this message, the sender * * *, and then the logo of my mobile phone?

What model is your mobile phone, domestic machine or Nokia smart machine?

If it is a domestic machine, then your mobile phone should have software similar to "anti-theft tracking", and the mobile phone has been successfully set up and locked with that number before. Every time the mobile phone is switched, it will automatically send a short message to the preset number to inform the current sim card information used by the mobile phone. Solution: Try to restore the phone to its factory value. Some domestic machines are abnormal, and you can't restore the factory value! )

For Nokia smartphones, if you have installed anti-theft tracking software before joining, you need to format the phone and enter *#7370# to format the phone for standby. Some powerful anti-theft software, even if you format the phone, you can't format it, so you can only do it hard. Press *+Dial key +3 at the same time in the power-off state, and then press the power-on key until nokia appears on the screen.