IPhone 4s suddenly stopped connecting to 3G network

I have been using my phone all day, on imessage with a few people.
My 3G network was working perfectly fine earlier today until about 2 hours ago when I noticed the messages I was sending were no longer being sent to the people I was talking to.
The 3G network symbol no longer appears in the left corner of my screen. I have full bars and I am connected to wi-fi but none of my messages will send to anyone. Also, Facebook, Twitter, and some other apps say I have no connection too.
I have no idea what's wrong. I've rebooted my phone a couple times, turned the 3G network on and off, reset my network settings.. still nothing seems to be working.
If anyone knows how to fix this problem, please let me know.
Thank you.

Hi ejd:
Thanks for posting your troubleshooting steps. The auto-configure option generally works fine, but occasionally, it will not configure Wi-Fi networks automatically. You can follow the troubleshooting steps here: http://support.apple.com/kb/ts1398 There's a segment that shows how to manually configure the Wi-Fi connection called "If you're unable to locate or join a nearby Wi-Fi network.
Give those steps a try, and let us know your results. You may need to call your Internet provider for help on locating your Wi-Fi settings on your computer.
Regards,
MikeS_VZW
Follow us on Twitter @VZWSupport

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