Changes

The principle behind cell phones, transmitting waves modulated with sound signals (see methodology) was first seen in radio communications developed in the 1920's. However the potential of this technology was not realised for many years, and 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. 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.

The principle behind cell phones, transmitting waves modulated with sound signals (see methodology) was first seen in radio communications developed in the 1920's. However the potential of this technology was not realised for many years, and 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. 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.

The following is a summary of jurisdictions that have regulated the use of hand-held cell phones while driving (as of September 2006):

The following is a summary of jurisdictions that have regulated the use of hand-held cell phones while driving (as of April 2008):

*[[California]], [[Connecticut]], [[Washington, D.C.|District of Columbia]], [[New York]], and [[New Jersey]].

*[[California]], [[Connecticut]], [[Washington, D.C.|District of Columbia]], [[New York]], [[New Jersey]] and, beginning July 2008, [[Washington]].<ref>http://www.komotv.com/news/local/7470007.html</ref>

*[[Illinois]], [[Massachusetts]], [[Michigan]], [[New Mexico]], [[Ohio]], and [[Pennsylvania]] permit local municipalities to ban handheld cell phone use. 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.

*[[Illinois]], [[Massachusetts]], [[Michigan]], [[New Mexico]], [[Ohio]], and [[Pennsylvania]] permit local municipalities to ban handheld cell phone use. 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.