"It might surprise some that there really are people who have no wish to be in constant phone or internet contact all day long"
I'm one of them - there's nothing to stop you from switching it off - but it IS very useful - especially when things go wrong -
A year or so back we had to completely re-organise a business trip when the Chunnel suddenly closed for 5 hours . Sitting in a cafe outside Gare du Nord we manged the whole thing in 30 minutes - 2 people using smart phones. Trains, car hire, hotels, restaurants and the client (s)