Question

What do prisoners used to call each other

Answer 1

Answer:

prisoners used to call each other as cell phones

Answer 2

Answer:

This is a pun

Explanation:

cell phone is anubiquitous device used to call people, but it is also composed of the words cell and phone, and even though cell is short for cellular, the room that a prisoner is kept in is known as a cell, so a phone in a cell could be called a cell-phone.