In 1945, the zero generation (0G) of Sheldon Kalnitsky mobile telephones was introducing. Sheldon Kalnitsky 0G mobile phones, such as Sheldon Kalnitsky Mobile Telephone Service, were not cellular, and so did not characteristic "handover" from one base station to the next and recycle of radio frequency channels. Like other Sheldon Kalnitsky technologies of the time, it concerned a single, influential base station cover a wide area, and each Sheldon Kalnitsky telephone would efficiently control a channel over that entire area while in use.

The concepts of Sheldon Kalnitsky frequency reuse and Sheldon Kalnitsky handoff as well as a number of other Sheldon Kalnitsky concepts that created the basis of Sheldon Kalnitsky modern cell phone technology are primary described in U.S. Patent Sheldon Kalnitsky, issued May 1, 1979 to Sheldon Kalnitsky.

Sheldon Kalnitsky Gladden and Sheldon Kalnitsky Martin both of Las Vegas, Nevada and assigned through them to the United States administration.