"Only 17% of those with a mobile use their phone for anything other than to make calls or send text messages on a daily basis, avoiding the more complex features available according to research conducted in the UK from Mobeon, reports 160characters.org. Mobeon concludes that, although the services may be clearly explained in accompanying manuals, users often do not understand the purpose of additional services and therefore do not feel any need to learn how to use them."
There isn't too much more to do with a typical cell phone other than make calls and send text messages. I will assume they also include email in this. However if you are getting a Smartphone I would think it is exactly for using the advanced features. I wonder how many people who have gotten a Smartphone end up getting frustrated and not really using many of its features.