en-us https://www.intensedebate.com/users/1311267 Comments by bobbitza http://blog.iphone-dev.org/post/128573459#IDComment81501292 disable ur 3g reboot ur phone go to cydia and search for ultrasn0w install that and reboot the phone turn it bk on n ull b fine..make sure the 3G is off though. Tue, 22 Jun 2010 23:25:26 +0000 http://blog.iphone-dev.org/post/128573459#IDComment81501292 http://blog.iphone-dev.org/post/128573459#IDComment81501141 yes u can. I just unlocked mine n jailbroke it. Nothing is impossible..just difficult. Tue, 22 Jun 2010 23:24:15 +0000 http://blog.iphone-dev.org/post/128573459#IDComment81501141 http://blog.iphone-dev.org/post/128573459#IDComment81501046 disable ur 3G and thru cydia install ultrasn0w reboot the phone and restart it with the simcard u want it to run on and make sure ur 3G is disabled!!..and it will work. Tue, 22 Jun 2010 23:23:41 +0000 http://blog.iphone-dev.org/post/128573459#IDComment81501046 http://blog.iphone-dev.org/post/128573459#IDComment81500803 download itunes 9.2 google redsnow download that then update to IOS 4.o thru itunes once u do that then you will have to find the update firmware located in ur files google that up see where your itunes saved the firmware to update the iphone then run redsnow and run it do what your supposed to and let it do its thing for a few min and your fine. That! will get you Cydia now thru cydia search or lookup * ultrasn0w * and run that but before u do make sure ur 3G is off!..install ultrasn0w and reboot ur phone. While its off stick the t-mobile simcard in the phone and turn it back on. Let it do its thing and it will pick up signal of your other carrier. I did it a few hours ago i am currently using my phone on t-mobile. I have a iphone 3GS 16GB and i just did it for my best friend too on its 3G cuz he upgraded to 3.1.3 firmware and he needed his jailbroken and it worked for him too so do as i said and you wil unlock ur phone n jailbreak it. Good luck! Tue, 22 Jun 2010 23:22:13 +0000 http://blog.iphone-dev.org/post/128573459#IDComment81500803 http://blog.iphone-dev.org/post/128573459#IDComment81390869 nevermind i just unlocked it i ran redsnow with the iOS 4 and did that so it jailbroke it and then through cydia installed ultrasn0w n ran it popped my att sim out n put the tmobile one in got activated and now works on tmobile Tue, 22 Jun 2010 11:19:28 +0000 http://blog.iphone-dev.org/post/128573459#IDComment81390869 http://blog.iphone-dev.org/post/128573459#IDComment81387574 let me know if it worked my 3GS just upgraded to IOS 4.0 and i lost fkin everything dude im dumb as a brick but let me know if it worked for u i was gonna use redsnow again and unlock it but that will only add cydia to my apps i need to unlock it so i can use it on t-mobile again...let me know if it worked for you. Tue, 22 Jun 2010 10:44:29 +0000 http://blog.iphone-dev.org/post/128573459#IDComment81387574