[M.D. Holloway]

I spend half my time teaching reps, managers, maint techs and engineers. Other instructors are real pricks about cell phones ringing. I always say "before we get started, lets turn the cells to vibrate, by all means take the call - it could be family, business or a booty call, all of which deserves more attention that me, just take it out side." the participants always respect that. Been doing it your years and never had a problem.

If I ever get the opportunity to teach in college - I would do the same.