found on phonescoop
http://www.phonescoop.com/carriers/forum.php?fm=m&ff=5&fi=1821016
Just to clarify, Houston goes live tomorrow morning.
here is a small list of some of the cities going live soon;
Baltimore - August 18
Houston - August 19
Minneapolis - August 20
San Diego - 9/15
Los Angeles - 9/16
Phoenix - 9/16
Sacramento - 9/17
Portland - 9/18
Seattle - 9/23
San Francisco - 9/24