Cellular phones and pagers depend on printed and integrated circuits, advanced materials, and miniaturization techniques enhanced by chemistry.
AT&T Labs developed mobile car telephones in the 1940s, but they were unpopular due to a lack of communications channels.
The 1980s brought a big breakthrough when wireless communications were divided into a series of cells that automatically switched callers as they moved so that each cell could be reused.
Cellular phones quickly became popular. Chemistry has also played a role in the development of rechargeable lithium-ion batteries in cellular phones.