Why are the messages that I send keep showing up as not sent?

[AC Question]

mesage not sent keeps showing up

On TeX meages keeps showing message not sent and all have been sent

 

[B. Diddy]

Re: mesage not sent keeps showing up

Welcome to Android Central! Which device do you have? Try going to Settings>Apps>All ​(or the App Manager), select Messaging, and Clear Cache.