A:AnswerThe phone is not Unlocked. It is sold under T-Mobile.
It is a GSM device.
And yes with a T-Mobile Straight Talk Sim, this device can be used under Straight Talk.
A:AnswerAfter the ZMax updates its software, it still has 10GB of open internal memory available for apps. This is MUCH more than most phones in its price range, as most have only 1GB to 3GB of open internal memory.
A:AnswerThe ZMax is locked to T-Mobile. Your old T-Mobile SIM card should work if it is the correct size. T-Mobile sells the ZMax with a SIM card designed for 4g LTE. If your old phone does not have 4g LTE it might be a good idea to use the newer SIM card.
