I feel the same @barbara-eddy. My current limitations/reasons are really around the integrity issue. I haven't found a robust solution to allow the students to use Math apps (apps, Wolfram etc) without the ability to communicate etc. Without a huge budget at least. I have a dream to remove calculators from my classroom, but it's taking time.
I seem to remember something about a classroom that didn't use calculators come up at the Tech Math Discussion at OCMA a few years ago. Who were they? I don't know. Anyone else not using calculators even just in the classroom outside of tests?