As the technology advances, we are moving into more new and latest technologies. Once there was 1st generation voice communication which used analog signals for voice communication using stationary wired telephones. In 2G or 2nd generation, the analog signal was digitalised and we were able to communicated voice and text using wireless cellular technology called mobile phone. Now a days, we are using 3G or 3rd generation mobile phones in which data transfer is at higer rates than 2G, now we can send videos and graphics or video calling , live T.V is easily available with a higer speed. This evolution in the cellular telephony service is known as 3G. Now scientists are researching on the advancement over 3G technology in which the data tranfer will be much faster.
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