IPhone 4s won't send iMessage?

I got my iPhone 4s about 7 or 8 months ago and it's in really good condition. It's never been dropped. It has no problem connecting to Wi-Fi but I always have the cellular data turned off because I have a 2GB limit. Even with the cellular data turned off I've never had problems sending messages using the Wi-Fi at home. The problem started about 2 weeks ago. Every time I try to send an iMessage it sends about 90% but then it just stops and does nothing. After it stops I send the message as a normal text and it works just fine. I do know for a fact that my phone has issues and everyone else's is fine. I have had ios 7.0.2 since the launch date and didn't have any problems at first. I have my iMessage set up to send/receive from my phone number. I don't have my e-mail set up on my phone. Can someone give me any information on how to fix this?

IMessage always sucked because it would randomly stop working at the worst times, I noticed if you have a bad signal to Wi-Fi it won't send. Also it could just be something with the login for your account, you can try to go into your iTunes settings in your settings app and try to log out / back in, try logging out and restarting then logging in, etc. But I always had problems with iMessage

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