I think it depends on how much you think you would use all the bells and whistles. I love love love my smartphone. Here are the reasons why:
1) texting is so much easier (I was once a person who despised the very idea of texting. once I started however, I was easily sold on the brilliance of texting esp. since I have a small child and timing needs to be up to me sometimes);
2) apps for child to play with;
3) apps for me to play with;
4) GPS at my fingertips
5) internet ability
6) apps that make family life easier (ex., shared grocery lists so I add something at work, husband goes to store - has most updated list; shared calendars, etc.)
7) ability to respond to emails just about wherever I am
8) just to make life generally easier. I've been at a store, looking for something, but knew I saw it online. Quick, go online on phone and ta da, there it is;
9) if you forget your coupon from a store, but you have it in email form, you can usually just hand the clerk your phone
10) piggy-backing on number 9 above - less to carry around because so much is all in one.
I have a Samsung Galaxy smart phone. I love it. I'm always telling my Mom she should upgrade, but she questions the need for the price increase with her lifestyle. although, I watched her painstankingly text someone the other day on her antiquated (my old) phone & it almost killed me. Plus, she doesn't have GPS in her car, and it is invaluable for that. I think with kids, it is awesome. At a restaurant, after he's eaten, but has to sit there quietly while the adults do boring talk, my son can play on the phone quietly for a lot longer than if all he had were crayons and a coloring book.