How do I get T-Mobile to work on my 3.1.2 Please Help

[asl06]

I just purchased an 16GB 3gs unlocked and I tried putting my t mobile card in it and it doesn't work. Please helppppp!


Thanks

 

[Applejuiced]

Is it already JB?
Go into settings,general/about and let us know what modem firmware version you're on.
Do you see a cydia icon?

 

[asl06]

Yes it's jailbroken with the Cydia icon. the modem firmware is 05.11.07

thanks for the help!

 

[ste1164]

You should go into cydia and download blacksn0w it should unlock your phone. Turn 3G off as T-Mobiles 3G bands are not supported by the iPhone. Then insert you T-Mobile sim.