What device do you have?
Was it unlocked before you bought it?
Are you a T-Mobile customer?
To add, you need to know whether or not your device is supported on your carrier's network. If the network is not compatible then forget it. And then it is also important to know if you are you are using a legacy device (BBOS.... OS7 or earlier) or a BB10 device.
Hey there Were you ever able to get your phone up and running?