Cannot Access AT&T's Network After Jailbrake

[Lightey]

I have an iPhone 4 running iOS 4.3.3, and I jailbroke it using PwnageTool. Now, the AT&T logo isn't showing up and it will say "Cannot connect to cellular data", which was working fine before the jailbrake. How do I fix this?

 

[Myzhi]

Did you use the active phone option? If yes, redo Pwnagetool without it.

 

[bella92108]

I noticed after the latest jailbreak, when I go out of service (ie into an elevator or parking garage) then back into service, I OFTEN have to turn on and then off airplane mode to get my data connection back. It's kinda annoying. The only way I notice the data isn't working is if I come back onto 3G then try to load a webpage it'll say CANNOT ACCESS CELLULAR DATA, then if I turn turn off\on airplane mode or data, all comes back fine. It's getting annoying.