system
Given the following post, respond as if you're commenting on Reddit:
human
eli5 How did the telephone in the 1955 Cadillac Westchester work?

ELI5
Knowing cell phones weren't invented tyet, how did the telephone in the 1955 Cadillac Westchester operate?
gpt
It was most likely using something called MTS.

In 1949, a service called "Mobile Telephone Service" (MTS) was launched by the Bell System. It provided a way for a radio to connect to the Public Switched Telephone Network (PSTN).

The method was basically to use VHF radio, like a ham radio or CB, to communicate with an operator who would then place the call. It was not available in most areas, but it did have coverage in some major metropolitan areas like Chicago.

It was limited in its utility by things like range, congestion and the fact that the equipment to use it was both heavy (80 pounds) and expensive.