For the past few years I have engaged in several inappropriate conversations conducted over Twitter, Facebook, e-mail and occasionally on the phone with women I have met online.
I don't know how old my phone is, but it was only $10. It is a nice subconscious way of not having the Internet at your fingertips... e-mail, Twitter or Facebook.
If you're having dinner with friends and they're always on the phone or always texting, it's just impolite. Unless it's something important - like someone is in the hospital or something - don't do it.
I don't understand the iPhone. I just don't get it. Don't ya'll have to write serious emails throughout the day? How can you possibly manage detailed missives on a phone with no keys?