Send a short message to the other party to show an invalid conversation.

Well, your problem is probably conflict! A software such as address book contacts is enough ~! You should be an iphone user! Software conflicts often occur, don't worry ~!

The system prompts me to perfect the answer! Then I'll be more specific, but you will find it more and more difficult to use any mobile phone system. This is a normal phenomenon. Personal experience is to check your phone regularly or update your system! Have questions to ask!