So I've followed a lot of tutorials, and especially this one: http://www.hackthatphone.com/3x/b_3_1_2_3g.html I have a 32GB 3GS, 3.1.2, 5.11.07 baseband. This is my 9th time restoring 3.1.2 with iTunes and installing the Blackra1n bundle. Everytime I install, it says No Service with the T-Mobile SIM. AT&T Sim works fine in Edge and 3G. I put the same SIM in another phone and it works fine. Well I followed the instructions on that site and have done different combinations. When I first restore to 3.1.2 I have the AT&T sim in there so I can activate it. Then I take it out, put in the T-Mobile sim (also turning off 3G), and run Blackra1in, then when it reboots, I run Blacksn0w and wait for the bars to come. It just says No Service. I left the phone on for 5 hours, still says no service. AT&T sim works ok. Also tried Spirit JB, same thing. My baseband has not been moved up from 5.11.07 and the firmware I'm using is 3.1.2 straight from Apple (not custom) Any help appreciated.