[CrackBerry Question]

Well I'm buying an unlocked BB what specs do I need to be sure it will work well with T-Mobile service?

[Al moon]

what model number is it or was it on a previous carrier ?

[raino]

If it's a pre-BB10 phone, you want to make sure it has the UMTS 1700 band.

If it's a BB10 phone, you want to make sure it has: UMTS 1700 (aka AWS, or UMTS band IV,) UMTS 1900 (aka PCS, or UMTS band II,) LTE band 4, LTE band 2.

Here are the models of BB10 phones that work well on TMO:

Z10: STL100-3
Q10: SQN100-5
Q5: SQR100-1
Z30: STA100-5
Passport: SQW100-1 (this is the only model that's available at this moment)
Classic: SQC100-4