IPhone 5 iMessage not working?

My iPhone 5 has been unable to send or receive an iMessage since Sunday evening. I've just recently done the software update to iOS 6.1.is anyone else having this problem? How do I fix this? It's driving me nuts.

Try and sync it with your computer and also turn it off, wait 5/10 minutes, then turn it back on. Also, try deleting your Apple ID and then sign in with it again. Make sure you sign in to the App Store as well as iCloud then it should work. If not, call your carrier.

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