Once you unlock your Aria, you can use it on T-Mobile for phone calls, but for data you will only get EDGE speeds; no 3G because AT&T and T-Mobile use different 3G frequencies. In the case of the Nexus One, there were 2 different models. Both would work for phone calls on either network, but there was a specific model for T-Mobile 3G support and the second one only supported AT&T 3G.
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