Why does my mobile phone often send text messages, but no text messages come in?

You are infected with a mobile phone virus,

This kind of virus charges maliciously by hiding the service short message (users really don't know the user's money, because the service short message prompting the charge has been hidden by it), and the process such as mserver leads to you not seeing the service short message, which means that there is a virus in your memory card, so both the memory card and the mobile phone should be formatted at the same time.

Or install a netqin antivirus. There is a charge for this, but it is not very expensive. I'll help you kill it.