"...if you refuse to give out your cell phone number and accept calls or texts, you appear unaccessible compared to other faculty in the department. This can show up in student/instructor evaluations, which are considered in the tenure process (and I am pre-tenure)."
Well, crap. Already my teaching and research accomplishments are lacking relative to those of my colleagues. Now I have to worry about not being (technologically) available enough to my students?
In theory my tenure packet will be judged on its own, without comparison to anyone else's. I strongly suspect that in reality, that couldn't be further from the truth.