ok im new. so wassup i just got a iphone from my friend. He had it jailbroken and unlocked with a t-mobile sim card. I used to have a vu for at&t but i took the simcard out and slid it into the iphone and it worked. the internet and everything . Now since i updated and restored the iphone it says "Could not activate cellular data network" You are not subcribed to a cellular data service i can still send pics. n get txt but i don't know what went wrong help? i have firmware 3.1.2.