G network?
by barkkathulla[ Edit ] 2012-09-20 16:47:33
1G
ï Only voice communication
ï Weight upto 40 kg
ï Motorola first to release to release
ï Further slim down by palm mobiles
ï 1981 Cell phone system developed
ï 1983 GSM launched
2G
ï Voice communication &SMS
ï In 1990âs
ï 1g& 2g frequency overlapped
ï SMS is started in 1991
ï MSP(message service protocol
ï In 1994 survey in USA says SMS 1.0 was developed
ï 1994 fm developed
ï Polyphonic ring tone
2.5 G
ï Mms
ï DTS (data service system )
ï Infrared blue tooth
ï GPRS
ï Touch screen
