I regularly do work at a major London department store where most of the staff are on minimum wage. Using a mobile on the shop floor is a serious disciplinary offence. If they want to use one during their breaks they must be off the shop floor. I can't say I see staff using them in coffee shops or pubs either very often and I suspect that in the UK such rules are widespread.
When I visit offices, I don't see staff at work playing games on their phones and making / taking personal calls seems rare.
Why is it, apparently, different on flight decks? Is it because pilots consider the work so undemanding they need something to keep their brains occupied? If so, sounds like things have got seriously bad. Perhaps the flight deck screens should be generating challenges that require a response every so often - but that wouldn't encourage pilots to look out of the window when taxiing - or flying in class G airspace!