Hi, I couldn't find the answers in a search so I'm writing here. I have an iPhone 4S purchased in Japan from Softbank carrier (black sim card). I am living in USA now and have a plan with AT&T. If I try and use AT&T's sim card, I was unable to authorize the phone. Now I can enter the sim card, but it will say Searching..., No Service, or Invalid PIN. Is there any solution for me? Do I need a Gevey or R-Sim-III 3? I am I just out of luck? Will this process work? http://www.youtube.com/watch?v=YonFx8xXBKo Phone is modem firmware baseband 2.0.12 Version 5.1.1 9B206 Thank you for the help and sorry for the redundance.