A smart phone is basically a phone and computer in one. Most smart phones are capable of using all features of the Internet and most networks as if they were any other computer. The modern smart phone is touch screen based and requires very little manipulation to get the job done. Computer programs have taken a new form or life on smart phones; they are referred to as "apps" and are mostly self contained.
Do you allow phones in your classroom? Does your school allow them? They can be a blessing and a curse depending on the situation.