A:AnswerThis does not work on the Sprint Legacy Network. So if you were originally a Sprint customer who was converted to TMobile when they merged, this device is not compatible. Trust me I was just at the TMobile store today to activate it and that was the exact problem I ran into.
A:AnswerIf in the US, this device should work with any service provider. I currently use T-Mobile. But, I believe the device would work with AT&T, Verizon, etc.