Did you ask her about reception in shopping centers, grocery stores, underground parking garages, the metro, etc?
I've met people that for some reason or another, seem to believe that reception should be limited or non-existent when in the subway, in Costco, or in some underground parking lot. They don't realize that the lack of reception in these areas is often the fault of their carrier, or in some cases, even their phone.
How 'bout it ATT folks ...reception in shopping centers, grocery stores, office building, etc.
I'll tell you that my Verizon RAZR loses reception in the back of some stores, like grocery stores - but in others like COSTCO works fine. Have no service inside the Worldgate shopping center in Herndon (complete dead zone).