The big difference is that there could only be a few (well less than 100 anyway) simultaneous calls in the entire metropolitan area. They were toys of the 1%ers and very rare. https://gizmodo.com/5661414/5661414/5661414/this-is-what-a-mobile-phone-looked-like-in-1964and-there-were-over-a-million-of-them At a guess, the buttons are to pick the frequency. That would imply that only 11 calls at a time.
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