My iMessage won't work on my iPhone 4S after ios7?

So I updated to ios7 and now for some reason I can't send iMessages. It keeps saying "Not delivered". I can still receive iMessages but I just can't send them. I really need to know if it's something I can fix or do I have to bring it to the apple store.

I'm not an iOS user, but I've heard it has got a lot of bugs…

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