Why won't my iMessages send?

I have a iphone 4 that I just updated to ios 7. I can send the message but the bar that says sending stops at the end and stays there. I have tried to text multiple people but it still won't send

Have you tried closing the app or shutting of your phone? Sometimes it gets wonky and needs a reboot. Anyone I've spoken with hasn't had any problems with msg so hopefully it's an easy fix for you.

IMessage needs Wi-Fi or 3G connection or else it won't send

Omkar is righ slow connection dear…

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