TM doesnt "lease" from anyone. they own their own network. and they only have roaming in certain areas with ATT. And its not very many. Virgin is actually Sprint-Nextel the same as Boost. VZ and Sprint have roaming agreements as well.
ATT maybe a great carrier for you but chances are someone in your city would not agree with you.
TM bought the tower a block from my house from Cingular/AT&T, Cingular build it a year before they bought out AT&T's wireless and TM bought the tower just before AT&T acquired Cingular.
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