If you have a cgo2, there is a cgo2 app that DOES work that I just used on my iPhone 7plus, it just doesn't have all the camera settings. Just record and picture mode only.

Using iPhone 7 Plus with latest software update. CGO2 app does not connect at all. Tried the CGO app. I can see the image from camera on the CGO app, but I get the same errors described by Chris on 22 Nov 16. The app reports "Please install SD card" and "Change camera mode failed, Unknown error." I called Horizon Hobby and Yuneec. Both told me to delete and reinstall app...that doesn't work. CGO2 camera firmware update doesn't work. Both claimed to have never heard of the problem and told me to report issue to Apple. I asked if Yuneec planned on updating the App and they said no because there isn't a problem (he said there are people there at Yuneec that use the app just fine on the iPhone). I told him there are multiple people online complaining about the same issue. Zero resolution on this issue. My next drone and camera will be from a different manufacturer.

This appears to replace the older CGO2 app (which no longer connects to a CGO2 camera) and does connect to the CGO2 camera. But it doesn't recognize that there is an SD card in the camera, and other than displaying an image of what the camera sees, it doesn't do anything. You can't change any settings, and you can't take photos or videos either. Which means if you have a SteadyGrip, it's useless too. Yuneec burned bright for a while, but it seems they've only interested in selling new products, not supporting those their customers have already bought... :-(

I have a CGO2-GB camera, and was directed to use this app by Yuneec support. When using this version of the app, it reports "Please install SD card", even though one is already installed in the camera. When attempting to change the camera mode from video to photo, the app reports "Change camera mode failed,Unknown error.". I tried this with an old iPhone that still has iOS 8.3 installed and the behavior is the same. Thankfully, the CGO2 app still works ok on iOS8.3 (but not on iOS 10.2).