Totally Useless If You are on AT&T – PhantomPilots - DJI Phantom Drone Forum Review

If you are an AT&T customer, then this app does not work. I don't even know if it works on other mobile networks, but it doesn't work on the AT&T wireless network. It does work with Wi-Fi, but usually when I'm close to Wi-Fi, I have my laptop and don't need this Phantom Pilots mobile app.
Review by Gadget Guru on PhantomPilots - DJI Phantom Drone Forum.