Identifies the service carrier network uniquely, enabling connection to the correct network as well as roaming, if permitted. Used by CDMA networks instead of IMEI and IMSI codes to identify the device and service plan Identifies a user and their service plan to the GSM network (stored on SIM card) Identifies a physical phone uniquely on GSM networks CodesĬellular phones use a number of different codes to identify themselves and the user's account, and function on the network properly. Each cell is usually a hexagon which covers about 10 square miles. As a phone passes from one cell to another, its connection is switch over to the tower responsible for the newly entered cell. Territory is divided into cells (sections) serviced by a specific tower. Each phone can operate on about 1,664 different channels. Ĭellular phones connect to distributed towers holding transceiver cells.
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Secondary enforcement laws require observation of another violation before stopping the driver.
#WATCHDOG SOFTWARE FOR CELL PHONES DRIVERS#
The exceptions are New Jersey, which is a secondary enforcement law except for school bus drivers and learner's permit and intermediate license holders, and Colorado, Maryland, and West Virginia which have secondary enforcement laws. All except four states with cell phone bans allow police to stop and ticket drivers for breaking the law.In Montana it was for many years technically illegal to even possess a cell phone inside a car, due to an archaic law which was repealed in 2001.Colorado, Connecticut, Delaware, District of Columbia, Illinois, Maine, Maryland, Minnesota, New Jersey, North Carolina, Rhode Island, Tennessee, Texas, and West Virginia have restrictions on the use of cell phones by young drivers.Arizona, Arkansas, California, Connecticut, Delaware, District of Columbia, Illinois, Massachusetts, New Jersey, Rhode Island, Tennessee, and Texas ban the use of all cell phones while driving a school bus.Florida, Kentucky, Louisiana, Mississippi, Nevada, Oklahoma, Oregon, and Utah do not allow local governments to ban cell phone use.
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Localities that have already done this include: Chicago, IL Brookline, MA Detroit, MI Santa Fe, NM Brooklyn, North Olmstead and Walton Hills, OH and Conshohocken, Lebanon and West Conshohocken, PA.
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The following is a summary of jurisdictions that have regulated the use of hand-held cell phones while driving (as of April 2008): This creation of the "cellular concept" resulted in increased research into the possibility of evolving commonly used 2-way radio communication into real time speech.ĭue to distraction car crashes, injuries, and deaths, restrictions have been placed on the usage of cell phones while driving. The move towards the networks used today did not begin until 1947, when Bell Laboratory engineers Douglas Ring and Rae Young proposed using hexagonal grids with base towers at the corners (rather than in the centers) to allow communication. However the potential of this technology was not realized for many years. The principle behind cell phones, transmitting waves modulated with sound signals, was first seen in radio communications developed in the 1920s.