Dr. Marty Cooper is widely considered to be the inventor of the cell phone. Using a modern, if somewhat heavy portable handset, Cooper made the first call on a cell phone in 1973. At the time he made his call, Cooper was working as Motorola's General Manager of its Communications Division. Motorola had developed the idea of using cellular communications on a portable platform (i.e., a handset)in a non-vehicle setting. cell phoness Driving controversyused cellular phonde [edit] free ringftones free ringtonezs Mobile learning.
[edit] Cell sites have relatively low-power (often only one or two watts) radio transmitters which broadcast their presence and relay communications between the mobile handsets and the switch. The switch in turn connects the call to another subscriber of the same wireless service provider or to the public telephone network, which includes the networks of other wireless carriers. used cellular phjone 7 Mobile communication studies |
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