Wireless connectivity just as any other inventions has a lot to be told. The mobile radio telephone technology or as it is also called 0G, refers to pre-cellular mobile telephony technology in the 1970s. Even though not as swift as today, they laid the foundations for the forthcoming generation of truly wireless mobile telecommunications.
These mobile telephones were usually mounted in cars or trucks, though briefcase models were also made. Mobile radio telephone systems preceded modern cellular mobile telephony technology. Since they were the predecessors of the first generation of cellular telephones, these systems are sometimes referred to as 0G (Zero Generation) systems.
Technologies used in 0G systems included PTT (Push to Talk), MTS (Mobile Telephone Service), IMTS (Improved Mobile Telephone Service), AMTS (Advanced Mobile Telephone System), OLT (Norwegian for Offentlig Landmobil Telefoni, Public Land Mobile Telephony) and MTD .
It all started sometime around 1946, when Motorola and Bell System began operating the first commercial mobile phone service, known as MTS (Mobile Telephone System). And yes, back in those days calls were not connected automatically but by humans.
The so-called “mobile phones” were mainly installed in various kinds of vehicles, with a bulky transceiver neatly tucked somewhere in the trunk of the car, and a handset and a dialer positioned somewhere near the driver’s seat. Typically, the transceiver (transmitter-receiver) was mounted in the vehicle trunk and attached to the “head” (dial, display, and handset) mounted near the driver seat.
They were sold through WCCs (Wireline Common Carriers also called telephone companies or TELCOs), RCCs (Radio Common Carriers) and two-way radio dealers.