In June 2013, five friends launched a GoPro to the edge of space. As you do.
They hooked the camera up to a weather balloon, along with a cell phone which could log the contraption’s location. It was programmed to send a message as soon as it returned to cell phone range.
Everything was sent up and away about 20 miles from the Grand Canyon. The phone never sent back a message and they figured they’d miscalculated at some point.