mobile phone Network

Most phones run on GSM, which allows you to change SIM card and devices whenever you want. It also allows internet connectivity through 2G, and with 3G it's associated with CDMA to form WCDMA

2G provides slow internet access up to 114 kbps (via GPRS) or up to 1 Mbps (via EDGE)

3G enables fast internet access up to 42.2 Mbps, allowing live TV, multiplayer gaming, high speed downloads, etc.

4G connection provides very fast internet access up to 100 Mbps.

Threshold: Currently Supported in India: 2300 MHz frequency

CDMA offers better call quality & security but changing network provider is difficult and very few handsets support it.