Hi there!
3G is the third generation of wireless technology. It is a technology which gives you access to high speed internet which is not available in 2G which is available in INDIA now. With the GPRS which is available now the browsing sped is restricted to around 48 kbps and you will get a data transfer rate of about 4 to 6 KBPS, which is very slow if you are tring to download a file from the internet. With 3G you can get a data transfer rate of about 128 and 144 kbps (kilobits per second) for devices that are moving fast and 384 kbps for slow ones(like if you are in one location and not moving at a fast rate while browsing for ex. on a bike or when moving in a car etc.).
It is not only used for browsing the internet, you can use 3G connectivity for various multimedia features. you can make a video call and watch streaming videos, online gaming etc. on the move.
Coming to the cost its not too expensive. 3G services are already available from BSNL and the rates for browsing is less than 50 paise for each MB. Also there are several plans such as rental of Rs. 300 gives you a free data usage of about 500 MB ans after that you will be charged around 50 paise for each MB. This is excluding the voice calls that you make
Each minute of a video call will cost you around 30 paise to 50 paise depending on the tariff plan you opt for.
To avail the services apply for a SIM card from BSNL with 3G services or if you have a BSNL card with you, then you can opt for the 3G on the same. you will require address proof, id proof and passport size photographs (2 nos.) to get a new connection.
The handsets which are good include HTC, NOKIA and Iphone 3G. there are various handsets available but i suggest you go for a handset with 3G support of up to 7.2 MBPS cause you know as the time passes by technology improves and probably the speed on 3G can be improved in future. There are 3G enabled phones with 386 kbps too so choose wisely.
if you already have a handset which supports 3G then you can use the same. And if you are buying a new one and plan on making video calls then go for a phone which has a front video conferencing camera without which you cannot make video calls.
Hope this helps and if you need more info reach me at helping_people99@yahoo.in