How do I get a jailbroke 3g iPhone working for my gfs tmobile account?
If the iPhone 3G has been restricted to any other network than T-Mobile, You need to unlock it from restriction. by doing so, You can use your GF’s Tmobile SIM card with it.
You can unlock an iPhone 3GS safer and easier using remote unlocking service. You can get the remote unlocking service for an iPhone 3Gs from www.TheUnlockSpot.com at affordable cost with easy unlocking guide. Good luck mate.