The name usually given to original GSM, CDMA, and TDMA networks. It uses the spectrum more efficiently than analog (1G) systems and offers digital encryption of conversations. 2G networks introduced data services for mobiles starting with SMS.
Three primary benefits of 2G networks over their 1G predecessors were:
- Digitally encrypted phone conversations, at least between the mobile phone and the cellular base station but not necessarily in the rest of the network.
- Significantly more efficient use of the radio frequency spectrum enabling more users per frequency band.
- Data services for mobile, starting with SMS text messages then expanding to Multimedia Messaging Service (MMS).
With General Packet Radio Service (GPRS), 2G offers a theoretical maximum transfer speed of 40 kbit/s (5 kB/s). With EDGE (Enhanced Data Rates for GSM Evolution), there is a theoretical maximum transfer speed of 384 kbit/s (48 kB/s).
 systems and offers digital encryption of conversations. 2G networks introduced data services for mobiles starting with SMS.){kind=link}