After seeing quite a few unconfirmed youtube videos of Phantoms being flown to unbelievable heights, I wanted to see what other pilots on this forum would-honestly- say is the highest altitude you have flown your Phantom. Here, in Canada, Transport Canada cautions that 400 feet is the limit, but we all know Phantoms are flown above that every day. Pretty hard to police the restriction. If you are flying in a wide open space and your aircraft won't endanger anything , I don't really see any problem with seeing what it will do. Not something you would do very often, but perhaps every once in awhile. Some of these youtube videos are unbelievable. I have my doubts when someone says they have flown their Phantom beyond 4,000 feet using stock equipment. I have flown my Phantom II Vision Plus up to 1,080 feet on a clear day with light wind. No problem at all with WiFi or any control. Nice photos taken from that height. How high have you flown?