Why does the mobile phone automatically send text messages to report the location every day?

The mobile phone is probably poisoned. There are three possibilities for mobile phone to send SMS automatically:

The mobile phone is poisoned. I forcibly downloaded Trojan software and sent a message automatically. It is recommended to brush the machine.

Someone who has installed monitoring software will automatically reply to text messages, so it is recommended to brush up.

There is something wrong with the information center.