I am not being overly dramatic when I declare that yournSmartphone is your Interface to and Controller of your digital world.
To start you use it for every form and type of communication. It doubles as the source of all of your news and information. It is the best recepticle for most of your media and entertainment. Lastly its ecommerce capability puts your supermarket and favorite retail store in your pocket. It also serves as a virtual business office at the end of your arm.
As time passes it quickly and dynamically evolves and morphs to incorporate every other need you may have. This means that your smartphone is or can be the source of your education and training.
Shortly new ways and means will emerge to turn our smartphones into actual controllers for all forms of physical devices, equipment and appliances.
As voice command and recognition improves we must prepare for the capability of being able to control our real/analog world through our the spoken word.