Why is my imessage suddenly not working on my iphone 5s?

[iMore Question]

I have been using imessage for a long time without issues and suddenly it stopped working to receive and send imessages. I have not updated or done anything out of the absolute ordinary with it lately. It says it does not recognize my phone number all of a sudden. I have turned it off and on again and it remains the same. It shows imessage as "on" in the settings.

 

[Fit24]

Sorry to hear that your iMessage is not working. Please hit the link below and follow the suggested steps; let us know if your problem was resolved.
How to troubleshoot and fix problems with iMessage | iMore