The beauty in all those smartphones is that you can upgrade their utility by attaching all sorts of mini-tools.
For example, you can turn your iPhone into your personal cameraman, by using a motion tracking device called iPhone Swivl.
What does it do? The Swivl can track movements using a sensor, in which time the iPhone records smooth panning video. The Swivl can tilt up and down and rotate up to 360 degrees.
All you have to do is place the sensor on the actor and behold the Swivl magic!
It works with the iPhone and some Android devices, as well.
Take a look at how it works: