3G is an ITU specification for the third generation (analog cellular was the first generation, digital PCS the second) of mobile communications technology. 3G promises increased bandwidth, up to 384 Kbps when a device is stationary or moving at pedestrian speed, 128 Kbps in a car,
and 2 Mbps in fixed applications. 3G will work over wireless air interfaces such as GSM, TDMA, and CDMA.
The new EDGE air interface has been developed specifically to meet the bandwidth needs of 3G. 
3G artinya Generasi ke 3 untuk komunikasi mobile GSM atau ada yang menebutnya UMTS (EDGE technology) , yang sebelumnya Generasi ke 2 yaitu GPRS. Pakai handphone 3G untuk office purpose sudah perlu sekarang, mulai dari chatting, e-mail, video call, watching television. 
Pentingkah 3G, dilihat dari featurenya tergantung yang kegunaan dan keperluan si pemakai technology 3G tersebut