Third Generation or 3G is a generic term used for the next generation of
  mobile communication systems. The 3G network gives you the power of 
higher  speeds to enjoy multimedia services , high speed mobile 
broadband and internet  access with the ability to view videos on your 
mobile handset. With a 3G phone  and access to the 3G network you can 
make video calls, watch live TV, access  high speed internet and enjoy 
live streaming at never before speeds. Recent 3G  releases, often 
denoted 3.5G and 3.75G, also provide mobile broadband access of  several
 Mbit/s to smartphones and mobile modems in laptop computers.
First Country to introduce 3G
The first pre-commercial 3G network was launched by NTT DoCoMo in Japan,
  branded as FOMA. It was first available in May 2001 as a pre-release 
(test) of  W-CDMA technology.
 The first commercial launch of 3G was also by NTT  DoCoMo in Japan on 1
 October 2001. Today there are about 60 3G networks across  25 
countries. The first commercial United States 3G network was by Monet 
Mobile  Networks. Emtel Launched the first 3G network in Africa. 
Advantage of 3G over 2G? 
Running on technology called High Speed Packet Access (HSPA), 3G 
networks can  send data many times faster than the rates of earlier 2G 
networks, which means  that in addition to audio, graphics and text, 3G 
customers can also send and  receive video content in 3G coverage areas.
 3G allows high speed Internet and  data services on the move. With 3G 
you can make video calls and use a host of  other multimedia services 
which are not available in 2G. 3G can be experienced  with 3G connection
 and 3G compatible mobile handset in 3G covered  areas.
What is HSPA and WCDMA? 
• HSPA (High Speed Packet Access) is a new generation communication 
protocol  that allows data connections up to 21 Mbps per user in good 
coverage and quality  conditions. Today mobile phones & USB Data 
Cards are available with  HSPA.
• WCDMA (Wideband Code Division Multiple Access) is a 3G technology version that allows data connections up to 384 Kbps per user in good coverage and quality conditions.
• WCDMA (Wideband Code Division Multiple Access) is a 3G technology version that allows data connections up to 384 Kbps per user in good coverage and quality conditions.
On what factors does 3G speed depend? 
Speed depends on handset used, coverage, network traffic and number of 
users  currently using the 3G network at that point of time.  3G can be 
experienced  with 3G connection and 3G compatible mobile handset in 3G 
covered  areas.
The bandwidth and location information available to 3G devices gives 
rise to  applications not previously available to mobile phone users. 
Some of the  applications are:
- Mobile TV – a provider redirects a TV channel directly to the subscriber's phone where it can be watched.
- Video on demand – a provider sends a movie to the subscriber's phone.
- Video conferencing – subscribers can see as well as talk to each other.
- Tele-medicine – a medical provider monitors or provides advice to the potentially isolated subscriber.
- Location-based services – a provider sends localized weather or traffic conditions to the phone, or the phone allows the subscriber to find nearby businesses or friends.
 
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