The Global System for Mobile communications is the most popular cellular approach in the world. According to the GSM Association, there were more than 2 billion GSM subscribers worldwide by June, 2008, which the organization said is more than 86 percent of the world's cellular market. GSM was accelerated earlier this decade by Enhanced Data rates for GSM Evolution (EDGE) and is in the process of further speed boosts by High Speed Downlink Packet Access and High Speed Uplink Packet Access (HSDPA and HSUPA) approaches.