T-Mobile rolled out 10 new markets with 1900MHz HSPA+ service just two weeks ago, and now the nation's fourth-largest carrier is adding another three markets. Users with unlocked handsets that operate on the 1900MHz frequency for HSPA+ (like AT&T handsets) will start seeing much higher data speeds in Seattle, WA; Minneapolis, MN and Atlanta, GA. These new markets bring the nationwide total to 18, with some of the largest markets in the country being represented.
This comes at an interesting time, as we're just hearing of T-Mobile's official plans to sell Apple devices (read: iPhone) on its network. The iPhone has traditionally only worked on 1900MHz and not T-Mobile's usual 1700/2100MHz (AWS) frequencies, so it will be interesting to see if this announcement pushes the rollout even faster.
T-Mobile's rollout of 1900MHz is much bigger than just supporting the iPhone of course, as it frees up spectrum for the carrier's move to LTE and support for a whole host of unlocked devices sold worldwide.