If I hear that phone - or any other phone - buzzing, ringing, or anything else at any future point, I will stop the lesson and not post it on Engrade. Yes, I realize it isn't fair to the rest of you. It is time for YOU to take some ownership over your class, peers, & education.
Last time I checked it said "Brentwood HIGH SCHOOL" when you drive thought the main gate. Sadly, the behavior does not match the expectation of that at all these days.
There will be no future warnings, second chances, or "put the phone on my desk." You will instead finish up the lesson on your own with the textbook, which you are now responsible to get EVERY DAY WHEN YOU WALK IN, just in case.