They(evil ones) have done their best to make cell phones necessary.
At least if you are still working.
And to some degree travel a great deal.
Otherwise,you still don’t NEED them.
I know...and have met..quite a few people who do not have a smart phone.
But there is know denying they are here to stay.
I’ve never had an iPhone.
All I do is make/take calls.
This one AT&T unit works just fine for me:
http://www.samsung.com/us/mobile/cell-phones/SM-B780AZKAATT