Why 2G is still in use

1.1 Frequency division multiple access (FDMA) FDMA is the most basic way of creating channels, by assigning users to nonoverlapping frequency bands, it was used in first and 2G cellular systems . In a system with N users and a total bandwidth W, each user can be assigned a bandwidth of W/N.

1G supports voice only calls. 1G is analog technology , and the phones using it had poor battery life and voice quality, little security, and were prone to dropped calls. The maximum speed of 1G technology is 2.4 Kbps.