look on their web site and coverage areas.
http://www.mycricket.com/cricketcoveragemaps/
St. Louis, Las Vegas, Oklahoma City, etc are tri-band only phones. If someone got a Sprint 6700 to work in Las Vegas, then I should be ok. But I just figured I would add my phone to my fathers existing Sprint unl. shared plan and pay only $20/mnth, heheheheh. Just need to flash my phone back to Sprint now