Have an iPhone 3GS on XT. Over the weekend I updated it to 3.1.2 and re-jailbroke it using black rain. Since I have updated it, when I go on safari or check my email using 3g, its comes up with "Could not activate cellular data network" about 60% of the time. If I turn the phone on and off it starts working again, or if I leave it a while, it will start working again. Just after I updated it to the new software and before I jailbroke it, it was doing the same thing so im pretty sure it doesn't have anything to do with the jailbreak.
Any Idea's and is anyone else having ther same problem?