If you are like most speakers, the next time that you give a speech you are going to be hoping that your audience understand the importance of public speaking and puts their phones down while you speak.
I mean really, you’ve spent time creating and rehearsing this speech, the least that they can do is to give you their undivided attention. Unfortunately, I think that we all know that this probably is not going to happen. Perhaps a different approach is called for. Maybe you should be telling your audience to take their phones out.