-Well, not exactly, but you had to go to one of those kiosks if you were not home and wanted to talk to someone on the phone.
-But, grandpa, that cant be. People could just walk in there and take the phone with them.
-No, my child. They had a cord. You could not use them without the cord.
-How stupid. What was the cord for?
(Idea by @tomiahonen)