Looking at the past, we have different version of G..,2G, 2.5G, 2.75G, 3G and now 3.5G.
3G starts with UMTS (Universal Mobile Telecommunications System) with maximum speed of 384 kbps, but usage different technology then GPRS. The maximum speed, so far, supported by UMTS network is 7.2 mbps called HSDPA (High Speed Downlink Packet Access) , sometimes known as 3.5G. Work is also progressing on improving the transfer speed with the HSUPA (High-Speed Uplink Packet Access) which could be known as 3.75G. There are different versions of HSDPA, which supports 1.8 mbps, then 3.6 mbps speed.
3G network uses different band of (HSDPA 2100 / 900 for Europe/Asia and (HSDPA 850 / 1900 for America).
With high speed, you can use 3G network to make video calls, VoIP calls, surf internet, watch movies, cricket match on your TV. Well its not free, you have to pay for it.
You need to have 3G enables handset in order to use it, please check before buying, if your handset supports 3G or not. Just supporting 3G is not enough, I recommend you to go for HSDPA phones for higher speed.
Like Nokia N73 supports 3G, but the maximum supported speed is 384 kbps. On the other hand, Apple iPhone 3G, Samsung i900 Omnia and HTC Touch Diamond have HSDPA 7.2. There are some intermediate phones like Samsung black jack have HSDPA 1.8 mpbs.
UMTS phones are available in the market ranging from 60$ to ...$, you can choose the phone as per your requirement.
Having 3G mobile and data plan subscription could reduce the cost of calls to zero.
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