Picked up a used T-Mobile branded Dell Streak 7 off of craigslist, took it to a T-Mobile store got the sim card and had it activated on the 2GB plan.
Get it home and it only connects to EDGE! Very slow speeds. T-Mobile phone in same house gets 4G speeds.
The box of the Streak 7 also says "4G capable".
Any ideas why it might only be connecting to EDGE?