When I was a telephone operator in the mid to late 70’s I worked as a Toll operator for the last year there. We each worked a 8 pair cord switchboard and we occasionally got “Mobile Calls” from people on car phones like in the ad. I remember once an older operator next to me telling the caller, “mobile move to higher ground” because the reception was cutting out while she was trying to connect the call. Mobile calls were all operator assisted calls back then, no direct dialing from car phones. The calls were all connected and disconnected by the operator on a cord switchboard, just like a long distance call on a payphone was then.