Why does N72 automatically delete all messages after receiving more than three messages?

Hello, this situation is generally caused by various reasons, such as system files being destroyed or illegal third-party software implanting dangerous programs in drive C, which can also be called mobile phone virus. The best way is to use process management software such as APPMAN to find out if there are any processes that you have never seen or are suspicious, and then find that program (usually APP program) to delete, because general mobile phone antivirus software doesn't think this program is a virus; If all the above methods fail, you can use the hard grid method to solve it. Generally speaking, there is no problem.