What is 4G: 4G signifies to the fourth generation of cellular wireless standards. This is a successor to 3G and 2G standards. The nomenclature of the generations usually terms to a change in the basic nature of the service. The initial was the move from analogue (that is, 1G) to digital (that is, 2G) transmission. This was obeyed by multi-media support, spread spectrum transmission and at least 200 kbit/s (3G) and now 4G, that refers to all IP packet-switched networks, mobile ultra-broadband (that is, gigabit speed) access multi-carrier transmission.