Jitterbug/Greatcall claims to have a very large coverage area because they have service agreements with most of the major cellular providers, including ATT. My decision to buy the phone was based on those claims. I also bought a whole lot of airtime minutes before I found that my Jitterbug phone wouldn't work in an ATT service area where I spend 6 months of the year. Most of those minutes expired since I couldn't use them. I called Jitterbug to complain that I bought into their service because of their ATT coverage area claims and wanted my money back. The operator told me they didn't guarantee coverage and would not refund my money for the all the airtime I couldn't use. That is not only deceptive advertising, but it is bad customer service!