4th Generation Internet Coverage - 05/11/2012

So what is 4G? In short, it's the name given to the fourth generation of mobile networks, just as the previous generation is called 3G. It's basically an improved, faster version of 3G which is only just developing in the UK. So far it's mainly available in London and a few other big cities however a company called Everything Everywhere (who owns Orange and T-Mobile) plan to provide 4G network to 98% of Britain by 2014.
 
So how is 4G so much better than 3G? Well for starters you should be able to stream video to your handset much more fluidly, without the endless buffering message. You’ll be able to use 4G to make and receive better quality audio and video calls. Just as you can load several webpages at once on a desktop PC, the same should be possible from your mobile phone – meaning you can get more done, more quickly. It will also be good news for software developers who will produce a new generation of smartphone apps that can take advantage of faster connection speeds.
For businesses, and especially SMEs, the benefits stretch even further. You’ll be able to send and receive larger, more complex documents more rapidly, opening up the option for remote-working for thousands more people. With a fuller rollout of 4G, even people in rural locations should benefit from a reasonable standard of mobile broadband – an exciting prospect for any business that isn’t based in a major city.
- http://blogs.independent.co.uk/2012/11/07/4g-%E2%80%93-is-now-the-time-to-join-the-party/

4G vs 3G
                                        3G                               4G

Data Throughput:	Up to 3.1mbps	Practically speaking, 3 to 5 mbps but potential estimated at a range of 100 to 300 mbps.
Peak Upload Rate:	50 Mbit/s	500 Mbit/s
Peak Download Rate:	100 Mbit/s	1 Gbit/s
Switching Technique:	packet switching	packet switching, message switching
Network Architecture:	Wide Area Cell Based	Integration of wireless LAN and Wide area.
Services And Applications:	CDMA 2000, UMTS, EDGE etc	Wimax2 and LTE-Advance
Forward error correction (FEC):	3G uses Turbo codes for error correction.	Concatenated codes are used for error corrections in 4G.
Frequency Band:	1.8 – 2.5GHz	2 – 8GHz

- http://www.diffen.com/difference/3G_vs_4G

Taken from - www.expertreviews.co.uk