The origin of such materials in the resource dedicated to mobile communications, it is quite clear: willy-nilly, most of us are subscribers of a wireline operator. Traditional attitudes to fixed phones - an always-available connection for a nominal fee, a more modern attitude cell phone users - a very cheap alternative. But is it really? Almost the first time in 15 years of mobile communications would lead us to ponder this simple question. And to think is always useful with a calculator in hand, no matter how beautiful the numbers and percentages not we painted in the press releases.