Was flying on my buddy's ranch in way SW Texas near Alpine - it's beautiful out there and I was just starting to get some nice video. To cut a long story short, Phantom just flew off into the distance.I could see it but no matter what I tried could not get it back. Finally it crashed into a valley about two kilometers away, I could see as I was on the ridge looking down on the valley. Two others were spotting for me too. Terrain too rough to even consider searching. It landed in a ranch owned by Herb Kelleher of SW Airlines fame, a compact 190,000 acre smallholding! We called the ranch manager and left a message asking if his men were ever out in the valley and if they found it could they call me. I'm not hopeful as I've only ever seen a truck in the valley one time. So do I need to report it as missing to the FAA? I have registration number on it, but stupidly not my cell number. The camera was still working when it crashed - nice close up of grass. Bummed, Dallas.