My mom became a realtor in the late 80s and had a car phone. I knew a handful, not many, of other people that had them. We did not know anyone with a true mobile phone though I know they existed. At that point in the late 80s-through the 90s my dad had a "brick" which was more like a walkie talkie than a cell phone for military stuff (though that may have been for appearances, I am pretty sure it operated sort of like one, but the thing weighed like 10 pounds).
At the toddler's parent/child class that we go to, they have a shelf of old phones for the kids to play with, it's actually pretty funny that they don't mimic using those at all as phones--but they will pick up calculators and other smaller devices and talk on them. I wonder how long before memory of flip phones and phones with cords will be extinguished. I think it's happening quickly, except for in toys/old picture books. My older kids, all teens now, have never owned a cassette tape (and when they found my old collection when they were all under 10, they were like what the hell is this stuff?). I showed them a floppy disk (the small/hard kind, not the giant ones) and they had no clue as to what it was. It is pretty hilarious to show them stuff like that. Though all of them knew vinyl--I think that must be back in again, since my oldest has been combing thrift stores and the like for record players, and was interested in saving a bunch of albums I was going to dump o goodwill.