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A potted history can be found here

 

1st G - network

 

Analogue phone calls and modems circuit switched technology

 

15 kbits per second

 

2nd Generation networks ( GSM )

 

64 to 200 kbits per second

 

Phone calls

Data calls

Fax Calls

Packet Switched Data Calls ( IP over cell phone )

Picture Messaging

email

 

3G

 

300 kbits per second to 1 mb per second

video calls fast data transfer all internet technologies offered

 

4G ( Not yet widely available )

 

Intergrated wireless technologies - satellite etc

A Guide to Generation ratings