Mobile communication standards have evolved over time to support new applications and increase bandwidth capabilities: 1) 1G networks in the 1980s supported only analog voice calls with limited bandwidth. 2G digital networks in the 1990s enabled SMS and greater bandwidth. 2) 2.5G networks like GPRS and EDGE in the late 1990s provided packet-based data and higher speeds. 3G networks starting in 2002 enabled broadband Internet, multimedia, and video calling. 3) 4G networks expected in 2010 will provide much greater bandwidth of 200Mbps, allowing services like mobile HD video streaming. This evolution has aimed to meet higher user demands and close the speed gap with fixed networks.