There are hundreds of companies across the world who provide cell phone companies in the world. The exact number becomes harder to measure as new companies enter the markt and others are merging with companies like AT&T.; The largest providers in the world are: China Mobile, Vodafone, China Unicom, T-Mobil 1, Cingular, Orange, Verizon and American Movil. Under some of these names there are multiple brands which may look like separate companies. Such as with America Movil who has the TracFone, Net10, SafeLink and Straight Talk brands. The same with AT&T; who has their retail stores and then the go phone.