How do those beeping things work that people carry around on their belts? There are several types of pagers but, basically, its all done by good, old- fashioned radio waves. Someone sends you a text message with a touch-tone phone or it can also be sent by email and the message is forwarded to the thing on your belt, which then emits a beep or vibration to tell you youve got a message. This is achieved through a cooperation of communication technologies basically, messages are broadcast on a certain radio frequency through a group of radio base stations, and the pager receives that message.
The pager has a LCD screen which displays the phone number or text message you are receiving. The simplicity or complexity of the kind of message the pager can receive depends, in part, on whether it is a numeric pager or an alphanumeric pager. If it is numeric, the callers numeric message is what you receive (usually their phone number for you to call them back). If you have an alphanumeric pager, a text message is transmitted to you by a carrier operators transcription of a telephonic message. Or text can be sent to you through an alpha entry terminal or a modem. Other options...
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