I wouldn't mind not having a phone, except for business use. Must have a business phone, or there is no business. I do love that phones are so functional now. A camera, calendar, calculator, GPS, internet, MP3 player... the list goes on infinity. I canceled my home phone a year or so ago, which saved money too.
I'm not one of those people who's always on my phone (in fact, I rarely actually use it), but I would miss it if I needed to do any of the gazillion things that it does for me.