As long as you're in urban areas or major highways connecting areas
you'll have service in pretty much every major city in the USA.
However, it should be noted that once you get off the major highways
service drops off dramatically.  Not as much as it used to, but
coverage is there for urban areas and the connecting highways.  That
said if you really want more complete coverage you'll sign with a
carrier that has analog fallback such as Verizon, old network cingular
and AT&T Wireless.

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Bill,
Your news reader implies you live in Columbus.  T-Mobile offers good
coverage in urban areas and along interstates in OH.  I like them better
than the new AT&T network, although probably not as good as AT&T + Cingular.
Verizon's coverage is so robust, except for SE OH, you should make sure to
use the tryout period to make sure the T-Mobile phone works in all the same
places.

Bill Radio
Click for Western U.S. Wireless Reviews at:
http://www.mountainwireless.com