A cell phone, landline phone or cellular phone, sometimes shortened into a just cell or simply phone, is a small portable phone which may make and receive telephone calls over a public switched telephone network while the user is travelling within an individual phone service area. There are three primary mobile phones, which vary according to the operating system, hardware and software, and communications features. Some phones include a built-in DVR (digital video recorder), enabling the user to record phone conversations as they happen. The other mobile phone type generally has an LCD display monitor and controls on the keypad, similar to a personal computer. Some newer models include a miniature GPS navigation system, which may be pre-loaded into the phone.

Most cell phones have various internal components including memory, battery, circuit board, screen, speaker and various other hardware components. The circuitry consists of various components such as a microprocessor, digital circuits, RAM, random access memory, USB, flash memory, etc. The microprocessor is responsible for processing data commands to and from the hardware devices via the communication channels such as radio, CD, TV, and others.

The microprocessor is controlled by software, including instructions for processing signals within the cell towers' range. The MTSO (Mobile Service Provider) is the entity that provides these services. The MTSOs generally control the transmission of signals between the base station and the customer. Some MTSOs also control the reception and transmission of digital voice signals.

The MTSOs also send and receive messages and codes via radiofrequency waves to the base station. Cell phone users can choose from various transmission modes, including GSM, CDMA, and CDMA-SD modes. The CDMA technology enables the reception and transmission of certain specified digital channels; the most commonly used digital channels are CDMA carriers. GSM technology uses different frequencies, enabling two or more phones to communicate with each other. The CDMA technology uses single carrier operations and allows a single phone to dial all the specified cell sites.

The main advantages of the GSM system are the low cost of operation and excellent voice quality. The CDMA system is similar to the GSM system; however, it transmits at lower speeds. This system can handle only a limited number of channels, and the voice channels available do not include the entire range of the CDMA channels. Some of the digital channels include CDMA1, CDMA2, and TDMA. The availability of digital voice enhances the performance of the system.

One of the major disadvantages is interference from other wireless devices on the same network. In the past, the major disadvantages associated with How Stuff Works. Phone systems were poor reception and poor sound quality due to interference. However, recent advances have helped to eliminate most of the interference problems associated with the original system. This improved technology has caused the cost of the How Stuff works Phone System to fall dramatically.

The newest technology in How Stuff works Phone System is the MTSO or multi-tasking control channel. The MTSO is a dedicated microprocessor that controls the multiple data sources used by cell phones to communicate. Using the MTSO, a cell phone will transmit and receive information simultaneously, as long as there is a compatible modem on the other end of the connection. The MTSO uses frequencies from the different control channels for this purpose.

One of the most important characteristics of the latest How Stuff works products is their use of the latest amp technology. High power amp systems can provide the power needed to run many digital or analogue cell-phones. The high power amps provide the most reliable signals and transfer the phone's audio channels with ease. The How Stuff works Company prides itself on its quality and has been in the mobile phone business for years. Their dedication to superior technology and customer satisfaction has made them one of the most popular brands in the market today.