This topic reminds me of a shopping experience I had this weekend. We needed some house stuff from an arts and crafts shop named "Michaels". I am not sure if this is a nationwide company or not, but it sells almost anything related to arts and crafts.
I know they tend to use coupons a lot, so I pulled out my iPhone, brought up the "Retailmenot" application, and pulled up a 50% off anything in the store coupon. There was a long line in the store, and I was curious to watch the cash register displays to see if anyone else was using coupons. I watched at least five transactions before I was up, and did not see a single person using a coupon (either paper based or electronic). I was amazed. It took me all of ten seconds to find a coupon that gave me 50% off anything in the store. And what really amazed me was that these people in front of me all had smart phones, but they seemed really busy with all their texting and game playing, and didn't seem to know they could be saving 50% simply by pulling up an electronic coupon.
I can't imagine putting myself at a disadvantage like that by not having a smart phone. I routinely use it to find discounts while I'm on the road shopping, or to read reviews on products before I make a purchase at a store. Or to get me home when I'm lost, find a good restaurant to eat at, and on and on. My total bill for everything is $72.00 per month, and I think it's an incredible bargain for all it does for me.
And yes, it even lets me make phone calls too!