I've got a Phantom 3 Advanced that I can't connect to my iPhone? I've got an Advance and an iPhone 7+ and I can't get to canera mode? I've heard that there is problem with iPhone? Can anyone help?

Hi Gronk, just to verify, does the app recognize the RC? Please help to confirm what the app says, if the app said the aircraft disconnected, please try to relink the drone and RC, but if the app showed disconnected, that meant the app hadn't connected to the RC, try to reconnect by rebooting the app or plugging the cable, reinstall the app or change another connecting cable.
If the steps above don't help, please help to confirm the version of your iOS, update it to the latest version via iTunes. See if it helps.