I am preparing this thesis on mobile phone services in USA. I am almost done with my project except for one mart of the thesis. I want to know about the top 5 mobile phone companies in USA. Which 5 companies have been the best and the leading producer of cell phones in USA. Does manufacturer like Sony Ericsson, LG, Motorola and Samsung make it to the top list? Or the market is still ruled by top manufacturer like Nokia, Apple and HTC? Also what is the average number of mobile phones manufactured by the top two companies?