Alrite guys before I get my head chewed off for asking for help I want to clarify that I have done my homework and am still a noob at iPhone stuff so plzz bare with me. I been reading tons on how to unlock my 3GS but I get super overwhelmed by all the methods and not sure which on will work best, maybe I can finally get this str8ened out.
How to go about unlocking 3GS 3.1.3, modem firmware 05.12.01 for Tmobile?
Use spirit to jailbreak, once jaibroken open cydia, let cydia initialize, open cydia, do the complete upgrade, reboot, open cydia, go to search, search for ultrasn0w 1.2, select install, confirm, reboot, and you're unlocked.