I just unlocked my white ATT Lumia 900 yesterday and am using it on Tmobile. It shows 4G (Not sure whether HSPA/HSPA+, I got speeds up to 1.8Mbps). So the good thing is that it does support more than just Edge.
I just checked it from work and its getting 5.7Mbps down. and 900Kbps down
I just checked it from work and its getting 5.7Mbps down. and 900Kbps down
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