I've been using their GSM for a bit over a year now in the New Yrok/Connecticut areas. At the time the local store said I would be much happier with a GSM/disital/analog phone because of coverage holes, they were right, there are many places I don't have a GSM signal (even in the middle of Manhattan), but I've never not been able to make a call other then in places you would expect it like subways.

I've been bery happy, both domestic and international with it (take the SIMM out and put it in a triband phone)