2nd Generation system for mobile communications. The 2nd generation is based on digital technology. 2G systems offer increased voice quality and capacity over 1G systems. Historically, 2G systems provided voice and a limited data capacity of 9.6 to 14.4 Kbps.
The 2G systems are regional standardized offering the possibility of regional (not worldwide) roaming. The terminals are smaller, have a longer standby time, and are cheaper. 2G systems have made mobile communications a commodity.
The most important 2G standards are:
2G systems are circuit switched. Later enhancements made higher speed packet switched data possible. These possibilities, like GPRS for GSM, are often referred to as 2.5G.