At first, two-way radios (known as mobile rigs) which is used in vehicles such as taxis, police cars, ambulances, and the like, but not mobile because they are usually not connected to the telephone network. Users can not dial a phone number from their vehicle. Large community of mobile radio users, known as mobileers, popularized the technology that eventually became the forerunners of mobile phones. Initially, two-way mobile radios permanently mounted in vehicles, but the next version is called transportables or "bag phones" equipped with a cigarette lighter plug, so it can be used as a mobile or as portable two-way radio.
In the early 1940s, Motorola developed a two-way radio backpacked, the Walkie-Talkie and later developed more as a mobile phone two-way radios for the U.S. military. In support of this battery-powered "Handle-Talkie" (HT) arm the size of a man.
In 1910 Lars Magnus Ericsson install the device in his car, though not a radio telephone. During a trip to a country, he must use a pair of long power cord so he could connect to the national telephone network.
In Europe, radio, the telephone was first used in the first class passenger trains between Berlin and Hamburg in 1926. At the same time, radio, telephone was introduced in passenger aircraft for air traffic safety. Radio telephony was introduced on a large scale in the German tanks during the Second World War. After the war German police in the British zone of occupation first used tanks used telephone equipment to run the first radio patrol cars. In the early 1950s ships on the Rhine is the first to use a radio telephone with the end customer as the untrained user.
In 1946, Soviet engineers G. Shapiro and I. Zaharchenko successfully tested their version of a radio phone installed in the car. The phone can be connected to the local telephone network with a range of up to 20 km.