Mobile phone is a small, portable communication device that enables people to make phone calls whenever where they are. It receives and gives out signals via the service providers’ transmitting towers and even via satellite.
The convenience of mobile phone is allowing people to communicate with one another without the limitation of regions and time.
Mobile phone is a device providing two-way communication. Signal transmission is the very basic concept for mobile phone. It uses the radio wave theories which are similar to the ordinary radios.
Mobile rigs were the beginning of cell phones for use in vehicles such as taxicab radios, two way radios in police cruisers, and the like.
Originally, mobile phones were permanently installed in vehicles, but later versions such as the so-called transportable or "bag phones" were equipped with a cigarette lighter plug so that they could also be carried, and thus could be used as either mobile or as portable phones.
In the late 1980s, along with the commercialised mobile phone system, the mobile phone industry started to develop rapidly and attracting more users to use mobile phones.
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