Here is a bit more information on what they were trying to do and then of course what happened:

The team’s video shows they weren’t exactly unprepared for the voyage, either, spending months testing parachutes, calculating wind trajectories, and custom 3D-printing their GoPro camera chassis for its maiden flight.

This quote is from one of the students

The phone landed ~50 miles [80 km] away from the launch point, from what I recall. It’s a really far distance considering there’s hardly any roads over there!”

They lost track of things but an unsuspecting hiker discovered the device and returned the awesome footage.

Enjoy the video!

thanks to sciencealert.com for the great info

thanks to chanmng/imgru for the pic