I Have the IPhone 3GS with Version 4.3.1 (8G4) & Modem Firmware 05.16.02.
I want to unlock it. I think its jailbroken. I have Cydia on it & ive installed Ultrasn0w but it still wont recognize my SIM card. I need help on what to do. & I'm new to all this jailbreaking stuff.