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What is the difference between 2G, 3G and 4G ? How it works?
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Analog cellular phones were the first generation while digital marked the second generation.First 1G service was based on a TDM voice infrastructure, In 2G cellphones moved from analog to digital.

3G refers to the third generation of developments in wireless technology, which enables fast data transfers. 

4G systems will utilize a packet infrastructure rather than a traditional telephone architecture. The 'G' stands for 'generation'.

3G - main features are; high data speeds, always-on data access, and greater voice capacity.The high data speeds are possibly the most prominent feature, and certainly the most hyped. They enable such advanced features as live, streaming video.There are several different 3G technology standards. The most prevalent is UMTS, which is based on WCDMA (the terms WCDMA and UMTS are often used interchangeably).

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