Imagine making a phone call without a keypad, a screen, a contact list, or even a number to dial! You pick up a bulky black telephone, turn a small crank, and listen for a particular sequence of rings.
Imagine making a phone call without a keypad, a screen, a contact list, or even a number to dial! You pick up a bulky black telephone, turn a small crank, and listen for a particular sequence of rings.
