A mobile radiotelephone, often in an automobile, that uses a network of short-range transmitters located in overlapping cells throughout a region, with a central station making connections to regular telephone lines. Cell phone is also called as mobile telephone. Professional cell phone greetings are a simple, cost effective way to professionalize your image. First let's look at what an unlocked cell phone. Some cell phones are designed to use a Subscriber Identification Module card or SIM card for short. A SIM card is a microchip that stores subscriber data. The SIM card is issued by a carrier and provides cell service by activating any phone into which it is inserted. A locked cell phone, however, will only recognize a SIM card from a particular carrier. If the cell phone is unlocked, it will recognize a SIM card from any carrier. The "lock" is software setting that keeps the cell phone "loyal" to one carrier.

A camera phone is a cellular phone that also has picture taking capabilities. Some camera phones have the capability to send these photos to another cellular phone or computer. Advances in digital technology and microelectronics has led to the inclusion of unrelated applications in cellular telephones, such as alarm clocks, calculators, Internet browsers, and voice memos for recording short verbal reminders, while at the same time making such telephones vulnerable to certain software viruses. In many countries with inadequate wire-based telephone networks, cellular telephone systems have provided a means of more quickly establishing a national telecommunications network.

Cell phones should be kept far away from children because the organs of fetus in children are very sensitive. It may effects by the exposure of electro magnetic field.

If cell phones played a limited role in society there would be no debating their safety. Wireless communication is packaged into hip, little slide and flip phones that defy location. Talk when and where you want, take business on the road and enjoy a growing range of extra features that deliver music, video, messaging and Internet capabilities. Extraordinarily intuitive and convenient, though they are, cell phones are powerful telecommunications devices.

Cell phones affect our built environment, most notably in the form of widespread advertising, not just in industrialized cities, but also in the third world. Unlike the Internet, which has sparked fears of a "digital divide" between the industrialized and developing worlds, cell phones have become popular all over the world. The cell phone is portrayed as glamorous, but also inexpensive. Many users decorate and personalize their phones, giving rise to folk art cottage industries. The cell phone has become a kind of art in itself, in which a user's choice of phone and decoration acts as a kind of personal statement.

The geographic region served by a cellular system is subdivided into areas called cells. Each cell has a central base station and two sets of assigned transmission frequencies; one set is used by the base station and the other by mobile telephones. Telecommunications system in which a portable or mobile radio transmitter and receiver, or "telephone," is linked via microwave radio frequencies to base transmitter and receiver stations that connect the user to a conventional telephone network.