You can retrieve your saved telemetry files from your device used to view/control your quad. (Android) The file is usually saved on your device as DJI, dji.pilot, FlightRecord
Also, everytime you fire up your quad, DJI has a built in telemetry recorder that records data more than every second. These ".DAT" files can be pretty big. You extract the file from your Phantom from the front USB connector.
There are several online sites that allow you to upload your files and have them converted to excel for viewing or implementing into a nice app called "DashWare"