Technology Reviews

  Mobile phones or cell phones are so called because they cover compartmentalized, cell like areas. The origin of the cell phone can be traced back to the year 1973 when Motorola came with World `s first cellular phone that was sold as Motorola Dynatac 8000X.
  Today, new mobile phones are added at a rapid pace. Parts of them are generally composed of the following: printed circuit board, antenna, keypad, LCD display - LCD, battery, microphone, speaker.
  Lately, they are available with a wide range of functions. In the list of some functions, depending on the cell phone you choose: the coordinates of stores; keep track of appointments, reminders, preparing lists of tasks, send / receive e-mail, play games, send text messages (SMS), internet access, watch and enjoy TV, built-in calculator, integration with other devices like GPS receivers, MP3 players, etc.
  Mobile phones, operating on radio frequencies, have developed an innovative cellular approach to combat the limited availability of RF spectrum. However, many cell towers are used to meet a wide geographic area.
  Each tower (base station), covers a circular area called a cell. A major section is divided into a number of cells allowing different base stations use the same channels / frequencies for communication. This allows thousands and thousands of mobile phone users to share far fewer channels.
  Another important aspect is that the phones need less power to transmit to reach a base station for each base station covers a smaller area. Reducing the required power transmission reduces battery size and thus the weight of the phone. This led to the miniaturization of cell phones that would not have been possible without the cellular technology.
  When you use your cell phone, following things. First locate the phone base station with the strongest signal, and requests for a channel assignment. The base station provides a channel assignment and the call is accepted. The call is then forwarded to the local telephone network if it is a regular phone, if it is transmitted via the cellular network. The call is then sent to its destination through the telephone network.
  When the cell phone is turned on, SID (System Identification Code) on the control channel, it compares to the SID programmed into the phone. If the SIDs match, the phone includes the cell is in communication with the system of the house. The phone sends a request for registration as well as the CIS and the MTSO keeps track of the phone `s location in a database. If the SID on the control channel does not match the SID of the phone and the phone is roaming.
  The three technologies currently used by 2G cell phone networks for transmitting information: multiple access frequency division (FDMA), multiple access time division (TDMA) / code division multiple access (CDMA).
  GSM (Global System for Mobile Communications) implements TDMA, to connect to providers of specific services in different countries. GSM module uses the subscriber identity (SIM). SIM stores all data connection / identification numbers necessary to access a provider of wireless services.
  Standard 2. 5G protocols are widely used GPRS, EDGE, to name a few. Some latest 3G protocols are: Universal Mobile Telecommunication Service (UMTS) Wideband Code-Division Multiple Access (WCDMA) High Speed Downlink Packet Access (HSDPA), Evolution Data Maximized (EVDO).
  A few popular models of mobile phones on the market have been offered by Nokia, Ericsson, Motorola, Samsung, LG, etc., with each model with its own range of collections. The year 2008 May system highest in the history of mobile phone with Nokia N-Gage 2, HTC Dream, Apple iPhone 2, BlackBerry Touchscreen, Sony PlayStation Phone which should be launched.