4G is the fourth generation of wireless communication technology. This technology refers to a data rate of at least 100 Mbps between two points anywhere in the world and seamless connectivity with global roaming capabilities across multiple networks. 4G was introduced in 2010, following the release of its predecessor 3G in 2009.http://www.businesswire.com/news/home/20091021005393/en/T-Mobile-USA-Offer-3G-BlackBerry-Smartphone-Voice

In its ability to offer greater bandwidth, 4G provides an enhancement to services such as IP telephony, mobile broadband Internet access, gaming and streaming of multimedia. In addition, 4G provides all the functionality of 3G and 2G networks and devices. However, functions such as digital recording and video blogging are capabilities of high definition 4G devices.http://www.wisegeek.com/what-are-4g-communication-systems.htm

Various different products and accessories are compatible with 4G technology. 4G technology may be built directly into a cell phone or a smartphone and offer the capability of high resolution photographs and videos. It may also be built into laptops or wireless cards as a means for faster data transfer for purposes such as business and entertainment. Some technology which formerly operated on a 3G network may automatically adapt to 4G, or may require reformatting in order to utilize 4G capabilities.http://www.associatedcontent.com/article/5697882/sprint_4g_mobile_broadband_in_boston.html?cat=15