G network?

1G

� Only voice communication
� Weight upto 40 kg
� Motorola first to release to release
� Further slim down by palm mobiles
� 1981 Cell phone system developed
� 1983 GSM launched

2G

� Voice communication &SMS
� In 1990�s
� 1g& 2g frequency overlapped
� SMS is started in 1991
� MSP(message service protocol
� In 1994 survey in USA says SMS 1.0 was developed
� 1994 fm developed
� Polyphonic ring tone

2.5 G

� Mms
� DTS (data service system )
� Infrared blue tooth
� GPRS
� Touch screen