Why did my mobile phone send more than 200 short messages to the same number without my knowledge?

If you are a smart phone, there are three possibilities: 1, there is a software that needs to send a text message and you didn't notice it; 2. If there is something wrong with the machine, judge that the sent SMS is being sent. Generally, just restart the machine. 3, the virus, you may want to kill the virus, but if it doesn't work, you have to check the machine ~ If it is a non-intelligent machine, it may be that the keyboard lock is unlocked, accidentally touching the keyboard and sending a lot of error messages ~ I hope I can help you ~