For T-Mobile users of their 4G HSPA+ network, you will want to take a gander at the following list. If you live in one of these areas, you will soon notice improved internet speeds. T-Mobile has been busy improving the bandwidth for these areas, and have bumped them up to a 42Mbps connection. You won't actually see those kind of speeds, but your averages should be higher now and approach 10Mbps, with peaks of up to 27 Mbps. Here's that list:
  1. Akron, Ohio
  2. Albuquerque, N.M.
  3. Allentown-Bethlehem, Penn.
  4. Brownsville, Texas
  5. Cape Coral, Fla.
  6. Canton, Ohio
  7. Charleston-North Charleston, S.C.
  8. Cleveland, Ohio
  9. Colorado Springs, Colo.
  10. Columbia, S.C.
  11. Columbus, Ohio
  12. Corpus Christi, Texas
  13. Fayetteville, N.C.
  14. Florence, S.C.
  15. Fresno, Calif.
  16. Harrisburg-Carlisle, Penn.
  17. Hickory-Lenoir-Morgantown, N.C.
  18. Killeen, Texas
  19. Lakeland, Fla.
  20. Lancaster, Penn.
  21. Las Cruces, N.M.
  22. Madera, Calif.
  23. McAllen, Texas
  24. Merced, Calif.
  25. Myrtle Beach-Conway-North Myrtle Beach, S.C.
  26. Napa, Calif.
  27. Palm Bay, Fla.
  28. Palm Coast, Fla.
  29. Panama City, Fla.
  30. Pueblo, Colo.
  31. Reading, Penn.
  32. Riverside-San Bernardino-Ontario, Calif.
  33. Sacramento-Arden-Arcade-Roseville, Calif.
  34. Salt Lake City, Utah
  35. San Antonio, Texas
  36. San Diego-Carlsbad-San Marcos, Calif.
  37. Santa Barbara-Santa Maria-Goleta, Calif.
  38. Santa Fe, N.M.
  39. Sarasota, Fla.
  40. Scranton-Wilkes-Barre, Penn.
  41. Sebastian, Fla.; State College, Penn.
  42. Virginia Beach-Norfolk-Newport News, Va.
  43. Wilmington, N.C.
  44. Visalia-Porterville, Calif.
  45. Waco, Texas
  46. York-Hanover, Penn.

The only phones on T-Mo's network that can currently take advantage of this upgrade are the Galaxy S 4G, myTouch 4G, T-Mobile G2, Sidekick 4G, G2X and the brand new Sensation 4G.

Source: AndroidCentral and T-Mobile