I first saw them on "Shazam!" Billy Batson and Mentor traveled in an RV and Mentor was always using one. He had to get the mobile operator tp connect him.It's funny how some of us forgot that we grew up seeing that kind of phone on pretty much every detective show until Jim Rockford gave us the impoverished P.I. who needed to find a phone booth.
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When "I Dream of Jeannie" was in reruns on whatever channel I was watching, the astronauts trained out in a rural area and a sergeant had one in a bag.