I spent two months a couple of years ago being an Apple technical support type.
iPhones, etc are great if you are a busy exec type and have lots of contacts.
Ask yourself.
Do I need email on the go more often than weekly?
Do I have contact lists on several different platforms at the moment?
Do I need at least 5 major apps which I will use often?
Am I tech competent (i.e. I may not know how to fix things, but I can find a forum online and do what it says)?
If you don't need the above, then you don't need a smartphone.
As an example, people who have them might include estate agents, people running small businesses who aren't always in the office, doctors, etc.