Difference.

3g and 4G do not differ much. $g is only an advancement over 3G. Reliance is said to be working towards 4G. I have Tikona net connection that claims to be using 4G technologies. $g will enable using internet in cars, trains etc. in better way.

http://en.wikipedia.org/wiki/4G

Thank you gulshan ji you had explained me clearly now i am clear about this.

3G is working in allover network but 4G is coming but not available now.Than 2G now 3G is better with some extra facilities and 4G will be more better.

Speed is the many difference Sasi and both are same in other aspects.

thank you for all the members who had rectified my valubale doubt.

nice explanation Gulshanji. Thank you for sharing the link also.