The mobile phone automatically sends out short messages.

This problem is caused by the mobile phone turning on anti-theft tracking! !

For example, a card you used before and a card you used later (then the former is A and the latter is B).

You have been using the A card, and then turned on the anti-theft tracking function in the settings! Take out the A card and replace it with the B card. At this time, the B card will send a short message to the designated anti-theft tracking number set when you used the A card before, until you owe money!

Solution: I suggest you plug the original A card back, look for it in the sub-menu related to mobile phone settings and security, and then turn off the anti-theft tracking function! If you can't find this function, you have to back up your own things and brush them again!