The document summarizes the evolution of mobile phones from two-way radios installed in vehicles to handheld cellular phones. It describes how early mobile radios could not dial phone numbers but allowed two-way communication. The first mobile phones were permanently installed in cars but later became portable with battery packs. The first handheld mobile phone call was made in 1973. Standards for cellular networks were developed in the 1970s and 1980s, leading to the development of 2G and 3G cellular networks.

1. The evolution of celphones By Tobías Frieder