Here is some of the data we collected from the GPS in the phone. The GPS has a limitation and stopped tracking altitude around 19,853 feet. I am not sure why this happened. It did track speed, so we might be able to guess how far it went up. When we get the photos back, we should be able to make a good guess as well.
Below are two charts of the ascent and descent rate.
The raw data is in the attachment below.