Although it might sound obvious, put your cell phone on vibrate or silent when on duty, and remember that it is not a top priority to answer your phone. I have seen officers on disturbance calls knock on the door then stop and take a call. I have also been clearing a building and my partner’s phone started ringing. I told him what my first FTO told me about my watch chiming on the hour: “If that phone goes off again while clearing a building, my first shot is going to be at you!” Seriously, a cell phone giving away your position or distracting you can be fatal.