I am preparing this thesis on cellular phone companies in USA. I am almost done with my project except for one part of the thesis. I want to know about the top 5 cellular phone companies in USA. Which 5 companies have been the best and the leading service provider in USA. Does service providers like T-mobile, Cricket etc, make it to the top list? Or the market is still ruled by the likes of Verizon, Virgin, AT&T, Sprint etc.? Please provide me with links to support your answers. Thanks.