This user guide provides instructions for using the VoicePing application on an F25 phone. It summarizes the following key features: 1) The side buttons are for push-to-talk (PTT), changing channels, and activating the microphone. 2) The front buttons are for turning the screen on/off and adjusting volume. 3) The Recent Senders section shows recent messages to see who contacted you. 4) Favorites allows adding preferred channels and uses volume buttons for PTT.