Differance between 2G technology amd 3G technology

[RohanS]

Can any one know what is the differance between 2G or 2.5G technology and 3G technology ?

I know that 3G better then 2G but what is advantages of 3G technology ?

[Ettan]

In 2G Digital voice data can be compressed and multiplexed much more effectively than analog voice encodings through the use of various codecs, allowing more calls to be packed into the same amount of radio bandwidth.

3G networks enable network operators to offer users a wider range of more advanced services while achieving greater network capacity through improved spectral efficiency. Services include wide-area wireless voice telephony, video calls, and broadband wireless data, all in a mobile environment. Additional features also include HSPA data transmission capabilities able to deliver speeds up to 14.4 Mbit/s on the downlink and 5.8 Mbit/s on the uplink.

[Yatish]

The first major step in the evolution to 3G occurred with the introduction of General Packet Radio Service (GPRS). So the cellular services combined with GPRS became 2.5G.

GPRS could provide data rates from 56 kbit/s up to 114 kbit/s. It can be used for services such as Wireless Application Protocol (WAP) access, Short Message Service (SMS), Multimedia Messaging Service (MMS), and for Internet communication services such as email and World Wide Web access. GPRS data transfer is typically charged per megabyte of traffic transferred, while data communication via traditional circuit switching is billed per minute of connection time, independent of whether the user actually is utilizing the capacity or is in an idle state.

[Marco-D]

3G is not totally reliable yet and can cause problems such as overheating and short battery life.

[Happy prince]

2G was next technology to 1G. It used digital modulation for voice transmission instead of 1G which have analog modulations. It has lower data rates for data transmission.

3G has higher data rates for data transmission and enhanced capacity for channels using frequency reuse