| Evolution of
Cellular Networks |
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| n | 1G
(AMPS, etc) |
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| – | Analog,
primarily voice, less secure, low bit data rate |
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| n | 2G
(GSM, CDMA, etc) and 2.5 G (GPRS) |
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| – | Digital,
more secure, voice and data |
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| n | 3G
(W-CDMA, CDMA2000, etc) and 3.5 G |
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| – | Digital,
multimedia, global roaming across a single network, |
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| 144Kbps
to several Mbps, limited IP interoperability |
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| n | 4G
(TBD) |
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| – | Global
roaming across multiple wireless networks, 10-100 Mbps, |
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| IP
interoperability for seamless mobile Internet |
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