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You can only control yours. I would never consider motioning to a friend of mine to put her phone away. My daughters yes, but not a friend.
I do a lot of public speaking. It's MY job to hold the audience's attention. If a lot of cell phones come out, then I'm doing something wrong. But if one or two people tune out, so be it. In any line of work where you give speeches, you can't take that kind of thing personally.