iMessage won't work, HELP!!!

I have the iPhone 4s and i recently did the ios7 update. After i did the update my iMessage and FaceTime says waiting for activation! So when i try to activate it, it says "Could not sign in. Please check your network connection and try again." I have reset the network connection and it still doesn't work! Its been like 5 days and I'm getting frustrated! Does anyone know how to fix this? please help me!!

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