I'm a 'young' Nanny (52 with a 4 year old DGD and another DGD due at the end of Feb). I must confess that I couldn't survive without my phone, particularly if I'm out with DGD playing Pokemon Go ( I have 2 Pikachu and DD doesn't have any! DGD loves Pikachu ). I use mine for Facebook, checking the train times Pokemon Go and WhatsApp, as well as more conventional uses.
I accidentally left my phone at work over the weekend a couple of years ago, it was like I'd had my arm chopped off, also a pain as I was trying to organise my 50th birthday party.
I've got another 'keen'... Ouch!