What is GSM CDMA 3G AND 2G IN MOBILE

GSM (Global System for Mobile communications: originally from Groupe Spécial Mobile) is the most popular standard for mobile phones in the world. Its promoter, the GSM Association, estimates that 82% of the global mobile market uses the standard GSM is used by over 3 billion people across more than 212 countries and territories.Its ubiquity makes international roaming very common between mobile phone operators, enabling subscribers to use their phones in many parts of the world. GSM differs from its

predecessors in that both signalling and speech channels are digital, and thus is considered a second generation (2G) mobile phone system. This has also meant that data communication was easy to build into the system.

In india Vodafone, Airtel, iDEA, BPL use GSM Signaling.
Reliance GSM and Tata DOCOMO have launched their GSM services recently based on Dual License acquisition.
Cost of instrument is low but service cost is high.
Many options are available while choosing handsets.

CDMA (Code division multiple access) is a channel access method utilized by various radio communication technologies. It should not be confused with the mobile phone standards called cdmaOne and CDMA2000 (which are often referred to as simply "CDMA" ), that use CDMA as their underlying channel access methods. One of the basic concepts in data communication is the idea of allowing several transmitters to send information simultaneously over a single communication channel. This allows several users to share a bandwidth of frequencies. This concept is called multiplexing. CDMA employs spread-spectrum technology and a special coding scheme (where each transmitter is assigned a code) to allow multiple users to be multiplexed over the same physical channel. CDMA is a form of "spread-spectrum" signaling, since the modulated coded signal has a much higher data bandwidth than the data being communicated.

In India MTNL Garuda, Reliance, MTS, Ping, Tata & Virgin Mobile are CDMA signaling providers.
Cost of instrument is high but service cost is less.
Not many options are available for choosing handsets.

What is 2G ?

2G is current signaling, that is second generation of mobile service. This allows you to make basic phone calls, send SMS, Voice Mails and send receive basic emails.
Existing mobiles are capable of providing this service and service cost is cheap.
Speed: 10kb/sec

What is 3G?

3G stands for Third Generation of Mobile Service. This will allow you to perform more on your mobile phone.
- Global roaming
- Send/receive large email messages
- High-speed Web
- Navigation/maps
- Videoconferencing
- Live Television streaming
- Electronic agenda meeting reminder
- Lots of high bandwidth applications like Live Stock updates, view product and shop instantly, Streaming Radios Service.

You need to buy Mobile handset which is capable of receiving 3G service. These phones are little costly.
You will also need to subscribe to 3G service for high bandwidth service. 3G service is not cheap and requires you to pay cost for high data transfer.

Speed: 144kb/sec - 2mb/sec