What does code 10-21 allow communication for?

Code 10-21 is used in law enforcement communication to signify a "telephone call." This code helps to streamline communication among officers and dispatchers by providing a succinct way to request or initiate a phone call. By utilizing this code, law enforcement personnel can quickly convey that a conversation needs to take place over the phone, rather than using radio communication, which can be reserved for more urgent matters or direct communications that require immediate attention.

The significance of using specific codes like 10-21 is to enhance clarity and efficiency in communication. This is particularly important in the field of law enforcement, where clear and concise communication can be critical during operations, ensuring that personnel understand the need for a phone call without needing lengthy explanations.