Quote:
Originally Posted by barryem
Phones that can only call one number existed long before cell phones. They were called intercoms, I think. They came in pairs and they could talk to each other.
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Depending upon where, and what time period one is talking about, intercoms are either very different, or only slightly different from the "can only call one number" phones.
The most common "can only call one number" phones are found along highways, and in college parking lots, where they connect to the State Patrol, or Campus Security, respectively.