Cell phones
lCell phones may be new devices, but they originated in the 1920Õs. Radios were used since 1921. Features were put into these radios in the 1940Õs, and they were used by police. The concept of the cellular phone was developed in 1947 which originated from the mobile car phone. The concept of the cellular phone was produced by Bell Laboratories.

lThe first actual cell phone was made in 1973 by Martin Cooper of Motorola and other assisting inventors who used the idea of the car phone and applied the technology necessary to make a portable cell phone possible. Cell phones were first made available to the public in 1984. Back then, they were very large, expensive instruments.