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Home > All Images > 1999 > October > 22 Oct 1999

Images Dated 22nd October 1999

Choose from 13 pictures in our Images Dated 22nd October 1999 collection for your Wall Art or Photo Gift. All professionally made for Quick Shipping.

Mobile telephone Featured 22 Oct 1999 Image

Mobile telephone

Mobile telephone. Mobile or cellular telephones use low-power radio signals to transmit to an antenna in the user's local area, or cell. The antenna is linked via telephone lines to an exchange devoted to mobile telephone calls. The exchange will connect the call to other mobile telephones, or if necessary to a normal telephone exchange if the call is not for another mobile telephone. If the mobile telephone moves out of its cell during a call, the exchange will automat- ically connect via the antenna of the new host cell. It does this by monitoring the change in the power of the radio signal between the mobile telephone and the antennae of adjacent cells