My wife is a limited cellphone user, so for the past year or so she's had a TracFone prepaid cellphone. An annual card works out to 8 or 9 dollars per month.

We're in Dallas this week, and her TracFone shows no service! I checked TracFone's coverage map and Dallas is definitely within the coverage area. Am I missing something obvious? I think at home Tracfone uses the Verizon network, if that makes any difference...