I'm considering buying a vivomove Sport for my son to tell the time and track steps and exerciseetc. His school doesn’t allow smart watches so it's essential that the screen is off during school hours, and is not easily reactivated, e.g. by a simple gesture. Alternatively it would be acceptable to switch off the screen permanently and just view and control fitness functions and data through the app.
Is this possible? if not how close could one get? Perhaps only the date showing on screen, which might not be considered a 'smart watch' function.