@Heartehx, Same thing here! Sprint iPhone 5 previously on 6.02 everything was working fine for months since purchase. I am not jailbroken, etc. Upgrade to 6.1 and I can no longer send or receive text to anyone w/o iphone. iMessage and Facetime Constantly show "Waiting for Activation". After a lot of searching, I have tried everything! rebooting, turning iMessage off, on a bazillion times, adding a new contact address, removing all contact addresses and adding new, switching contact addresses, etc etc. Same fail. If iMessage is failing to activate, then how can I send messages to iphone users? Maybe the SMS aspect is failing to register on Sprint's network? There is no way this is isolated to me (or a couple of users).
I should also mention that I have a new iPAD and => 6.1 w/o issue. Logs onto iMessage and Facetime w/o issue. I also changed it so that the ipad and iphone are using different contact email addresses. I do receive popup messages on both devices when I change the contact letting me know that the contact address has changed on "the other device". I even tried loggin out on iPAD then in on iPhone thinking maybe the same acount login was wreakign havoc. NOPE.
Bought my sons phone same time I did, we both did the upgrade yesterday, and only I seem to have the problem. One difference is that I have iPAD too.
This seems like a sprint SMS network connection problem, but that do I know... I am frustrated after trying everything I could think of to resolve.