I have iOS 7 and my iMessage is not working?

I have an iPhone 4 and I had to restore my phone today due to a mistake on my part. Everything is working perfectly normal except for my iMessaging. When I turn it on it's "waiting for activation" for about 15 minutes. And the send & receive option has my email address and my phone number but my number is dulled and doesn't allow me to tap on it. It was only using my email address and now it has completely stopped working all together.
Any help is appreciated!

Turn off and turn on your phone

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