An intentionally limited device like an old-fashioned pager might work. I know it doesn't make logical sense to limit functionality: one might ask, "can't you j

An intentionally limited device like an old-fashioned pager might work. I know it doesn't make logical sense to limit functionality: one might ask, "can't you just limit phone use to urgent notification instead of limiting yourself to a device that's physically limited to notifications?" Well, yes, but people don't work that way.