The era of Mobile || Advantages and disadvantages of mobile technology || Speech by Kajal Sah.

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Shillong: The era of Mobile Advantages and disadvantages of mobile technology, Speech by Kajal Sah. The Sentence is to try to explain a young era with mobile phones, where the young star is busy with mobile technology and fewer book studies.  Today almost young stars are deep spent time with mobile technology said to the Kajal Sah. Watch the above video to know more knowledge where is a speech by Kajal Sah. 

The first handheld cellular mobile phone was demonstrated by John F. Mitchell and Martin Cooper of Motorola in 1973, using a handset weighing 2 kilograms (4.4 lb). The first commercial automated cellular network (1G) analog was launched in Japan by Nippon Telegraph and Telephone in 1979.

The most important phone call in technology history was made. Using a prototype Motorola DynaTac, inventor Martin Cooper made the first call on a mobile phone. Forty years later, it's considered a brick compared with the diminutive devices we carry around.