Imessage won't activate phone number on iphone 4?

My Imessage was working fine earlier today but it suddenly stopped and won't come on. I have reset network settings and sign in and out of apple. It just says waiting for activation and i can't select my phone number i the send and receive section.

Make sure you have 3G or Wi-Fi! And the person whom you are iMessaging might not have 3G or Wi-Fi AT THAT TIME!

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