As a millennial I probably couldn't survive without my phone for a long period of time. There are plenty of times I'll leave my phone at home deliberatly (less now that I use @actifit) but I still don't need it constantly. Sometimes I feel better when I don't have my phone on me. Now for my dad, I really don't think he needs the new iPhone 10, he could do everything he wants/has to do on his iphone much better on his laptop. He'd be way better off if he had a simple phone instead of a smart phone.