Donald W. Wyatt Detention Center Week 1 Practice Test

What does the code 10-21 indicate?

Call by telephone Location Acknowledgement/Message Received Signal good

Correct Answer:

Call by telephone

Explanation:

In this context, the focus is understanding how ten-codes streamline radio communication. The code 10-21 means to call by telephone. It’s used when the person or unit wants to switch from radio contact to a phone line to discuss details more privately or thoroughly, without filling the radio channel. This is different from reporting a location (which is typically 10-20) and from acknowledging that a message was received (which is 10-4). The phrase about a “signal good” isn’t the standard meaning for this code, so 10-21 is best understood as a request for a telephone call.

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