Of course I could give it up. For 99% of people it's just a toy. Folks who insist that they Need one always make me roll my eyes.
Do I want to give it up? Don't be silly, of course not.
99% is way too high of a percentage.
If you look at it that way, everything is a toy. You don't need a car, it's a toy, get a bike, or better yet just walk, cause bike is a toy too.
I would describe and change this thread a bit, I'd say a smartphone is a tool, most people own that tool because they simply want it, not because they need it and they never use all of it's potential.
I could probably give it up, but I need a GPS navigation, I need Viber, I need a camera, I also use a grocery app for shopping... everything else, emails, Internet, etc... are "toys", although, at times they have come in handy like checking eBay progress, replying to an email instead of waiting to get home and then reply, etc...
Of course I could give it up, but it would make things a bit harder for me.
A smartphone will also replace a tons of other devices for you, GPS, music player, camera, alarm, even a flashlight. So why have all those things instead of having one thing?
Tablets and the rest IMO are items of luxury IMO, but a smartphone nowadays is as essential as a laptop. Can you give up your laptop? Of course you can, but it'll make things harder for you. You need a smartphone and a laptop.