TmoNews is reporting that come March 14th, T-Mobile will be launching its much-awaited HSPA+ service in a few more markets. These are rumored to include Miami, Los Angeles, Chicago, Dallas, and presumably Philadelphia while supporting the launch of a new 3G data device as well — the webConnect Rocket. Additionally, it looks like T-Mobile has finally started to overhaul their hideous cellular coverage maps by adding more zoom layers, population guides, and additional color coding for different network technologies (like the new HSPA+ service). Anyone excited to get their mobile 21Mbps on?

[Via AndroidAndMe]