Updated to iOS 6.1 now my SMS messages won't send

I updated to iOS 6.1 over the air yesterday afternoon. I got some good news so I sent out a couple messages to people but kept getting failure to send notifications. Before 6.1, I did not have any problem sending SMS messages. iMessages still works properly though. I am in the process of restoring the phone to see if this fixes the problem. If anyone else out there has solved this problem, please let me know.
I have a iPhone 5 running on Sprint.

What to Do When Your iPad Won't Turn On
http://ipad.about.com/od/iPad_Troubleshooting/ss/What-To-Do-When-Your-Ipad-Wo-No t-Turn-On.htm
iOS: Not responding or does not turn on
http://support.apple.com/kb/TS3281
iPad Frozen? How to Force Quit an App, Reset or Restart Your iPad
http://ipadacademy.com/2010/11/ipad-frozen-how-to-force-quit-an-app-reset-or-res tart-your-ipad
iPad: Basic troubleshooting
http://support.apple.com/kb/TS3274
iOS: Resolving update and restore alert messages
http://support.apple.com/kb/TS1275
iPad: Unable to update or restore
http://support.apple.com/kb/ht4097
 Cheers, Tom

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