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The number 10-20 is part of the ten-code, which is commonly used in emergency communications to convey specific messages succinctly. When it refers to "10-20," it signifies a request or provision of location. This coding system helps streamline communications among responders, ensuring that everyone understands the context quickly, especially in high-pressure situations.

By using "10-20," emergency personnel can effectively communicate their current location or ask for the location of another individual. This is crucial in scenarios where time is of the essence and clear, concise communication is needed to coordinate responses effectively.

In contrast, the other choices pertain to different contexts: "Call on phone" does not have a specific numerical shorthand within the ten-codes, while "Non-violent psych patient" and "Bomb threat" reflect particular situations that would not be accurately conveyed by the number 10-20. Thus, understanding the use of this code is fundamental for effective communication in emergency responses.