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