mobile phone

слайд 1 independent work technology and communication; mobile phone, chat rooms, sms. teacher: shermamatova sevara student: odilova nigora a mobile phone, cellular phone, cell phone, cellphone, handphone, hand phone or pocket phone sometimes shortened to simply mobile, cell, or just phone, is a portable telephone that can make and receive calls over a radio frequency link while the user is moving within a telephone service area. history - the first official mobile phone used in sweden by the swedish police in 1946; could make 6 phone calls before car's battery was drained - development of first cell phone (creation of towers/cells at bell labs in 1947. history cont. - 2nd generation: from the early 1990's - smaller, better batteries, huge …

This file contains 16 pages in PPT format (838.0 KB). To download "mobile phone", click the Telegram button on the left.