GPS is carrier independent. Makes no difference. As long as you have a BB data plan, you can access BB Maps and GoogleMaps just as you did on ATT.
The real issue is how good is the T-Mo coverage where you will use the device - where you live, work, travel and play? Just because the plans are cheaper, doesn't mean the service is the same or better. It is a given that ATT's coverage is much better than that of T-Mo . T-Mo's plan are cheaper because they are trying to attract more customers (IMHO).
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