Most people are happy with their, but if you're finding you've outgrown yours and need more functionality, it might be time to upgrade to a smartphone. A smartphone can offer you more advanced contact, e-mail, and calendar functions, additional productivity apps, a better Web browsing experience, and so much more. If you've been hesitant to graduate to a smartphone because it seems too technical or excessive, think again. The handsets in our gallery below are good starters, offering ease of use and the essential tools for messaging, voice calls, and productivity. Fair warning: most of these smartphones require that you sign up for a data plan, so keep that in mind as you're shopping around.