IMsg (on iPhone 5, ios6) stopped working?

Today my iMsg stopped working, and only works messages being sent to emails (ex. 1234@gmail.com as the imsg receiver). I haven't run out of data, and my Wi-Fi works because I'm able to access the internet on my apps. I've shut my phone on and off a few times and it still doesn't work
how can I fix this?

Try updating to iOS 7

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