Which of the following is NOT a type of fire service communication?

Digital messaging is not traditionally classified as a type of fire service communication. Fire service communication typically encompasses methods that have been standard in emergency responses, such as radiotelephone, which allows for audible communication over radio frequencies, visual communication, which can involve signals like hand gestures or lights, and verbal communication, which is direct spoken interaction.

While digital messaging may be utilized in modern contexts, especially with advances in technology, it is not a foundational method recognized across traditional fire service operations. The primary task of fire communication methods is to ensure immediate and effective dialogue during emergencies, which is best accomplished through the other recognized methods.