i have a jailbroken iPhone 3g with the new ios4 jailbroken w/ redsn0w. i want to be able to use the data plan that i just got for my number. Im on a family plan with At&t and i just got a new data plan put on my line. how can i start using it. i tried ultrasn0w with the source repo666.ultrasn0w.com and i installed it ultrasn0w but it still gave me could not connect to the cellular data network box. how can i start using my data plan.