What should be done if an officer receives a 10-21 call?

When an officer receives a 10-21 call, it signifies the need to make a phone call, usually to a specific location or to a person. The correct action in this situation is to respond to the dispatcher using a police radio. This response is essential as it keeps communication within the established protocols of law enforcement, ensuring that the dispatcher is aware of the officer's status and intentions.

Using the police radio maintains a chain of communication that is crucial for coordinating response efforts, relaying important information, and ensuring safety for both the officer and the community. It also allows dispatch to keep track of the officer's location and actions, which is vital for operational effectiveness and accountability.

While other options may seem practical in different contexts, they do not adhere to the communication protocols that ensure the safety and effectiveness of police operations. For instance, using a personal phone lacks the security and oversight of using a police radio, which could lead to potential issues with communication privacy, and not responding promptly to the dispatcher could result in crucial information being missed.