Answer Posted / chipmaker

the main difference is that the dada rate
2G-126kbps
3G-upto100Mbps
4G-1Gbps

and other difference is
2G-fsk,tdma,fdma
3G-cdma
4G-ofdma,LTE,3GPP,mc-cdma

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* ** *12* *123* *1234* *12345* *123456* ********

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