To begin with, however, the bulky telephone devices weighed an impressive 36 kilos, which is why they were only found in cars. It was only possible to make calls whilst actually driving, because the telephones consumed an enormous amount of electricity. A battery capable of lasting several hours or even days was completely unimaginable.
Over time, the devices became smaller and lighter, until the first “mobile phones” came onto the market in the early 1980s. But despite all the technological advances, these analogue telephones are still essentially what they have always been: devices for making phone calls.