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Phone
Siemens AX72.

A mobile phone (also known as a hand phone, cell phone, or cellular telephone) is a small portable radio telephone.

This cell phone can be used to communicate over long distances without wires. It works by communicating with a nearby base station (also called a "mobile tower") which connects it to the main phone network. When moving, if the mobile phone gets too far away from the cell it is connected to, that cell sends a message to another cell to tell the new cell to take over the call. This is called a "hand off," and the call continues with the new cell the phone is connected to. The hand-off is done so well and carefully that the user will usually never even know that the call was transferred to another cell.

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Hang a mobile from the ceiling, learn about levers/// Homemade Science with Bruce Yeany
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How does your mobile phone work | ICT #1
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Working paper model of mobile rocket launcher BM-21 Grad/ -21
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