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• First Generation (1G) was introduced in 1980s. It was used for voice services and was based on technology called as
Advanced Mobile Phone System (AMPS).
• Second Generation (2G) was introduced in late 1990s. It was based on digital technology and Short Message Service
(SMS). It used digital signals for voice transmission. It enabled text messaging. Also, Pagers were introduced for text
messaging.
• Third Generation (3G) enabled higher rate of data transmission and provided multimedia support. In this generation,
wireless technology is more enhanced over previous wireless technologies. Thus, it has helped in high-speed
transmission, advanced multimedia access, video streaming, video chatting on wireless signal, etc. It has been
commonly in use after year 2000.
• Fourth Generation (4G) of cellular service has integrated features of 3G with Internet compatibility to support
wireless mobile Internet, as the data transmission speed in Standard 4G (or 4G LTE) is around five to seven times
faster than 3G. 4G provides same features as 3G but with high data transfer speed. It provides data transfer
speed around 150Mbps. It enables for flawless service in applications like wireless broadband access, Multimedia
Messaging Service (MMS), video chat, mobile TV, HDTV content and Digital Video Broadcasting (DVB).
Some use Wi-Max technology in their 4G network, while other uses technology called Long Term Evolution, or LTE in
4G Network in India.
Wi-Fi (Wireless Fidelity)
It is a trademark of the Wi-Fi Alliance, is a wireless communication technology used for connecting devices in LAN. It
uses radio waves to transmit information via frequencies. Wi-Fi devices such as personal computers, smartphones,
video game consoles, etc., can connect to a network resource such as the Internet through a device called the Wireless
Access Point (WAP). Wi-Fi Hotspot is a physical location that provides internet to wireless devices by using Wi-Fi.
Worldwide Interoperability for Microwave Access (WiMAX)
It is a telecommunications protocol, which provides wireless broadband access to fixed and fully mobile Internet access. It
is used for long range of communication. Wi-Fi can transmit up to 54 Mbps whereas WiMAX can transmit up to 70Mbps.
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