Why does OPPOR7s always send text messages automatically?

If the mobile phone sends SMS automatically, it is recommended to follow the following methods:

1. Replace the SIM card and troubleshoot the SIM card of the mobile phone;

2. Carry out virus detection and anti-virus treatment on the mobile phone;

3. Back up the important data information of the mobile phone and restore the factory settings (Settings-System "More"-Restore the factory settings, please do not check "Clear completely").