In telecommunications, 4G Also known as "Beyond 3G", is the fourth generation of cell phone mobile communications standards. It is a successor of the third generation (3G) standards.
Source: RELOAD,Wikipedia
4G is all about convergence; convergence of wired and wireless networks, wireless technologies including GSM, wireless LAN, and Bluetooth as well as computers, consumer electronics, communication technology and several others. 4G is a Mobile multimedia, anytime anywhere, Global mobility support, integrated wireless solution, and customized personal service network system.
4G wireless technology is also referred to by “MAGIC” which stands for Mobile multimedia, Any-where, Global mobility solutions over, integrated wireless and Customized services. 
4G is an all IP-based integrated system will be capable to provide 100 Mbps for high mobility and 1 Gbps for low mobility , with end-to-end QoS and high security, and will offering various services at any time as per user requirements, anywhere with seamless interoperability, at affordable cost. The user services include IP telephony, ultra-broadband Internet access, gaming services and High Definition Television (HDTV) streamed multimedia.
Moving Beyond 4G
4G is not the end of all. "5G Technology" is already in research arena and is bound to up the data rate further.5G is going to alter the way of our usage of our cellphones; may replace our Desktop PCs/laptops. Coupled with innovations being done in the field of smart sensors, 5G mobile phones with extremely high data rates, IP core, and world-wide coverage will offer features which have not imagined so far.
Source: RELOAD,Wikipedia
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