HP h6315 / h6310 / h6320 / h6325
Available for Cingular?
it is a quad band (World Phone) You can use it with all GSM providers
Like Cingular, AT&T so you may put in any SIM card it will work.
But I dont know if T-MOble LOCKED the software for internet, so you may need to UNLOCK it
I called HP and thay say that after using it with T-Mobile for 90 days thay will give me the code to UNLOCK it