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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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