Why does my mobile phone send messages to others when I don't know anything?

Hackers hacked into it. They can use your mobile phone to send messages and make phone calls without your knowledge. Do you usually read strange text messages, or do strangers send you Bluetooth when Bluetooth is on or off? This is how hackers get into your mobile phone system. If you have bank information stored in your mobile phone, they can all see it. Have you seen the live broadcast of Xi 'an? It says in it.