Why don't you call sprint back and ask about the Airave. It's a little device that plugs into your broadband internet connection, and creates a femtocell (like a mini cell tower) in your house, and it works for all Sprint phones. Its like 10$ a month I believe, and theres a 50$ deposit. I could be wrong about the pricing, but that per month fee includes unlimited calling while in the zone that the airave creates.