What is 3G technology ? Why is it popular among cell-phones ?

Answer 1

The 3G wireless data technologies consist of UMTS and its HSDPA extension for GSM networks, and EV-DO Rev 0 for CDMA networks. These allow for much faster transfer speeds, averaging 300 Kbps for UMTS and 500 to 800 Kbps for EV-DO and HSDPA, or about that of a lower-cost DSL connection.

In simple terms, it's faster.

Answer 2

3G is short for third generation. It provides both voice and a high speed data transfer capability. It's popular since it is the existing standard and provides higher speed data transfers than the older designs.