Call Guard (Phone Line Lockout)

Circa Late 1980's to Mid 1990's

Use Case:

This device was to restrict the use of a landline phone. By inserting a key and engaging a physical lock, the device could prevent outgoing calls. This was particularly useful for parents who wanted to limit their children's phone usage or prevent unauthorized long-distance calls on a single line.

(H-3cm x W-6cm x D-4.5cm)