Global System for Mobiles is the primary technology used globally for 3G mobile networks, with about a 73 percent market share. GSM competes primarily with Code Division Multiple Access technology, which is the technology used by five of the seven largest carriers in the United States. While GSM provides compatibility, multitasking and speed advantages over CDMA on a 3G network, most carriers around the world are switching to the Long Term Evolution standard for their 4G networks. Writer Bio