On the Subject of Rotary Phones

Hello, this is emergency services, please hold...

• The display will show 3 numbers, top to bottom, representing a single 3-digit number.
• Whenever the module activates, these numbers will change.
• Add the new number to the old one, take the 3 least significant digits, and enter the resulting number. This number is now your old number.
• If you gain a strike from this module, your old number is replaced with the currently displayed number.