Apple ipod

Jailbreak and unlock the 2G iPhone 3.1.3 04.05.04_G band?

Recently upgraded to 3.1.3 firmware on my 2G iPhone with 04.05.04_G I can use jailbreak blackra1n but the problem comes when I try to unlock it to use with my T-Mobile SIM card. No service. I tried to downgrade the firmware but will not let me go back to nothing below the 3.0 firmware. I did, and even tried the jailbreak and unlock redsnow method and with the custom firmware. You can always manage to escape, but not unlock my card T-Mobile SIM. Can anyone help please?? I really want this iPhone. Thanks:) Now reinstall the 3.1.2 firmware I hope things easier to escape

There is no unlock solution even if you are able to downgrade and jailbreak.

JailBreak 3.1.3 Blackra1n Fail Fix And Updates For RedSn0w!