What should the rules be regarding checking messages, texting, using Facebook, during rehearsals? (poll 6557653)

What should the rules be regarding checking messages, texting, using Facebook, during rehearsals?

Never even bring a phone on stage.

Ok, to bring a phone (set to vibrate) on stage, check messages and respond in the event of an emergency.

Ok to use during rests or while the conductor is working with another section.

Other:

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See this poll on: https://poll.fm/6557653/embed