3G or 2G for T-Mobile

[Almy]

Settings, General, About, Modem Firmware.

That number needs to be compatible with whatever baseband can be JB'd. BASEBAND CANNOT BE ROLLED BACK, so be sure it's compatible.

You can also check to the phones firmware in the same area. And just make sure it's compatible with the current JB.

 

[175170]

all 2g can be unlocked

Yes. All 2G iPhones can be unlocked. I'm running mine that I just got 2 days ago. 2.2.1 unlocked and T-Mobile FlexPay. Works like a charm except the internet's pretty slow. Hopefully the next ten iPhone will support the T-Mobile 3G network. I was reading about how ATT was thinking about also going onto the 1700/2100 frequency, he one T-Mobile uses.

 

[Almy]

Is the baseband issue different between the 3G and 2G?

 

[175170]

Is the baseband issue different between the 3G and 2G?

Yes.