"The Lumia 521 can hit up to HSPA+ 21 speeds on T-Mobile's network. It's a little disappointing that it doesn't support the carrier's faster HSPA+ 42 or LTE networks, but it still managed to pull in some good data speeds, with an average of 5.4Mbps down and 1.5Mbps up. It also supports 802.11 b/g/n Wi-Fi and Wi-Fi calling."
Wireless broadband using some unknown Motorola tech, with a dish shaped antenna connecting to a tower 5 - 10 minutes a way in the small town nearby.
I cant get DSL out here (we are "too far out of the loop" for ATT, despite it being about 1 mile down the road, and since ATT owns "rights" to the area, which is apparently something that is possible with rural areas, We cant get anyone else to come out here either due to legalities.)
Anyways, nice speeds man. Maybe it does have HSPA+42?