Earlier this year, T-Mobile belatedly began rolling out its 3G network in 1,700-MHz spectrum it won from the FCC AWS auction several years ago. It launched with much fanfare in NYC back in May. T-Mobile plans to add a host of cities to its 3G-covered ranks by the end of the year. Here is a list of the latest getting that high-speed mobile goodness.Rumor sites dedicated to all things T-Mobile have been scouring the Internet for details on T-Mobile's 3G launch schedule. Several lists have turned up. This latest includes some of the country's biggest markets.

It appears that Baltimore, Houston, and Minneapolis already have gone live this week.

A handful of other cities will be covered by 3G in September. San Diego will go live Sept. 15; L.A. and Phoenix go live on the 16th, Sacramento on the 17th, Portland on the 18th, Seattle on the 23rd (odd that T-Mo's home town is so far down this list), followed by San Francisco on Sept. 24.

Other cities launching later this year include: Atlanta, Birmingham, Chicago, Dallas, Denver, Detroit, Kansas City, Memphis, Miami, New England, Orlando, Philadelphia, Tampa, and Washington, D.C.

While T-Mobile's roster of 3G-capable phones isn't super exciting, the HTC Dream -- an Android phone -- will be released later this year, supporting T-Mobile's 3G network.