Common handheld portable digital devices
Mobile phones (cell phones
A mobile phone or cell phone is used for mobile communication. As well a speech they may be used for text messaging, emailing accessing the Web. Many also allow you to send and receive pictures and video. Most mobile phones use a signal from a local transmission tower and will not work when you are out of range or if the signal is blocked by mountains, or even buildings.
Satellite phones use a signal coming from a satellite. They tend to be much more expensive to purchase and use. While you should never be out of range, the satellite signal may be blocked by tall buildings.
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