I bought an iphone 2g from a friend, and when I got it it was jailbroken/unlocked with redsnow (i am assuming because it came with cydia installed). I have at&t, with unlimited text and data on my plan. When I put in my SIM card the first time, the phone, texting and internet all worked (both the wireless and the cell internet). I then updated it through itunes to 3.1.3, and used the redsnow program to re-jailbreak/unlock it. I am confident that i followed the steps to the letter, but now my cell internet does not work. I cannot connect to any of my applications or to safari any longer. Has anyone had or fixed this problem? Any help is much appreciated.