In past it was a wonder when invented… at present it is the common thing you see in everyone’s hands… in future no wonder even if it replaces desktops and various bulky information carrier machines… it is MOBILE PHONE… the daily need and necessary of the human….
Having basic information about this technical wonder is a must…now lets see how it works…
WHY MOBILE PHONE ALSO CALLED CELL PHONE? :
The SIM (Subscriber Identity Module) card holds a microchip and slips into the handset allowing you access to a mobile phone network. This network is made up of a series of base stations that send signals used by mobile phones. The area covered by each of these base stations is called a cell and cells overlap to make up a coverage area.
Whenever you switch a mobile phone on it will connect to the nearest base station. As you move around you may get closer to another base station in another cell. When this happens, the network will automatically switch your phone to the other base station. As a mobile phone working depends on CELLs hence called cell phone also…
One of the most interesting things about a cell phone is that it is actually a radio — an extremely sophisticated radio, but a radio nonetheless…
HOW A CELL PHONE WORKS?
Mobile phones work by converting voice, text, multi-media messages or data calls into radio waves or radio frequencies (RF). Mobile phone base stations transmit and receive these calls – and connect callers to other phones and other networks.
The size of a cell depends on the area of coverage that’s needed and the number of calls that are made in that area. So, the smallest cells, i.e. more base stations, are where there is the biggest demand which is usually in crowded urban settings with high buildings and heavy population density, but the biggest cells tend to be in rural areas, where people are dispersed over a wider, less built up, area.
When a mobile phone caller is on the move, calls are automatically routed from a base station in one cell to a base station in another, thus providing the best signal and available capacity…
HOW AM I ABLE TO USE IT?
The principle is basically simple, because your mobile phone transmits a certain amount of radio signal, whatever base station nearest to you will capture its presence. Therefore, this gives you an “always online” mode ready to receive calls and texts. When another mobile phone user wants to contact you, his mobile phone will transmit a signal to the nearest base station in his location. This base station will then transmit to a series of telecom relay equipments such as channel towers or satellites until it reaches your local base station wherever you are. The same procedure goes when you are the one to call out to another number…
2G refers to second generation wireless telecommunication technology. While its predecessor, 1G, made use of analog radio signals, 2G uses digital radio signals. Based on what type of multiplexing (the process of combining multiple digital data streams into one signal) is employed, 2G technologies may be categorized by whether they are based on time division multiple access (TDMA) or code division multiple accesses (CDMA).
2G makes use of a CODEC (compression-decompression algorithm) to compress and multiplex digital voice data. Through this technology, a 2G network can pack more calls per amount of bandwidth as a 1G network. 2G cell phone units were generally smaller than 1G unit, since they emitted less radio power. Another advantage of 2G over 1G is that the battery life of a 2G handset lasts longer, again due to the lower-powered radio signals.
3G is the third generation of wireless technologies. It comes with enhancements over previous wireless technologies, like high-speed transmission, advanced multimedia access and global roaming. 3G is mostly used with mobile phones and handsets as a means to connect the phone to the Internet or other IP networks in order to make voice and video calls, to download and upload data and to surf the net.
The thing required for 3G technology is a 3G compatible phone like IPHONE 3G.it has nothing to do with number of cameras it have.. 3G phones commonly have two cameras since the technology allows the user to have video calls, for which a user-facing camera is required for capturing him/her.
Courtesy : wikipedia