Cell phone (telefone celular) is a wireless, portable, long-range, electronic telephone, which during travel can seamlessly modify antenna connections, from one radio reception cell to another radio reception cell, without dropping or losing the ongoing call.
Besides the agreeable voice work of a telephone, latest cell phones (telefone celular) have features such as SMS for text Celular , MMS for multimedia messages, radio, games, internet connectivity for email, browsing, blogging, music (MP3) playback, memo recording, built-in cameras and camcorders, ringtones, personal organizers, Push-to-Talk (PTT), Bluetooth and infrared connectivity, call registers, streaming video, downloading video, video call, and as well as foster as wireless modems for PCs that can be joined to the Internet.
The capacity in a cell phone (telefone celular) is obtained from rechargeable batteries, which can be recharged from the mains, a USB harbor or a cigarette lighter port in an automobile. Nickel Metal Hydride were the most common types of batteries, which due to the “memory effect” (the user can recharge isolated gone the entire battery is drained off) were replaced by Lithium-Ion batteries, which did not be anxious from any memory effect.
Cell phones (telefone celular) came into existence because of the invention of hexagonal cells in 1947, for the base stations by buzzer Labs engineers at AT&T. This was extra developed during the 1960s by fear Labs. During a call, the channel frequency could not be distorted automatically from one cell (base station coverage area) to option cell (base station coverage area) as the person traveled from the area of one cell to the place of unorthodox cell. Amos Joel of terror Labs invented a breakthrough invention and called it as the call handoff by which the channel frequency could be misrepresented automatically from one cell to unusual cell, during the similar call, as the mobile user traveled from one cell to complementary cell. Due to their oppressive construction, these phones were used mainly in automobiles.
The first practical cell phone in a non-vehicle setting, and which could be handheld, was invented by Martin Cooper, the General executive (Communications Division) of Motorola, who made the worlds first handheld cell phone (telefone celular) call upon April 3, 1973.
The technology by which the cell phone (telefone celular) works depends on the mobile phone operator; however, all of them use electromagnetic radio waves, which are in be adjacent to in the manner of a cell site (base station). The base station is composed of several antennas which are mounted on a pole, tower, or building. Cell sites are spread at a keep apart from of 5 to 8 miles (approx. 8 to 13 km) from each other. The low faculty transceiver from the cell phone transmits the voice and data to the nearest cell site. During movement, the cell phone will “handoff” the suggestion to new cell site. Mobile phone operators use many technologies to maintain the serene stream of digitized data from the cell phone to the cell site and vice versa.