2G

2G or second generation mobile services, refer to simple, mobile voice communications and low speed data services. The 2G phase began in China in the mid-1990s, and this technology is still widely used. The 2G cell phone features digital voice encoding. The major 2G mobile network platforms are CDMA, TDMA, and GSM. Since its inception, 2G technology has steadily improved, with increased bandwidth, packet routing, and the introduction of multimedia.

Hurray! provides three major types of 2G services:
SMS
IVR
CRBT