IPhone 5c not sending iMessage?

I turned my iMessage off earlier today because it wasn't working anyway. When I turned it back on, I was connected to the internet and it still wasn't working, the person I was texting also uses iMessages and said theirs was on. My iMessage usually works with my data but that isn't even working. I shut my phone off and turned it back on, and I even restarted but, nothing seems to be working.

Try to send message to your friends email (itunes, facetimes etc account) and to his number. If none of these methods works, i don't know how to help. I have had the same problem while imessageing with my dad. No messages appeared when he had sent me tons of them. Then i tried to text to his email, and the messages appeared to him. Hope this somehow helped!

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