I've been just about everywhere on the web and and completely frustrated. I have a 3GS and I'd like to use it with T-Mobile, having already purchased an activation kit for it. The iPhone was on iOS 5 and has modem firmware 05.16.05. I've seen conflicting reports on whether I have to change the firmware to the base iPad firmware or not. I was able to jailbreak it with ultrasnow, but couldn't then unlock it. I've tried redsnow with tinyumbrella, and it gets to the error 1015 and then when the log for tinyumbrella says it's done, there are 4-5 lines of white text on the iphone that reference greenpoison. Help appreciated. All I want to do is use the darn thing on T-Mobile, and sooner rather than later!