When I think of how many lives may have been saved over the last few years, by people being able to call 911 from where they are standing.........the cell phone would be the LAST thing I would want to give up. I do not use mine that much, but it sure came in handy twice, during emergencies.
I could give up the electric shaver. It would not bother me to lather up and do it the old fashioned way.