As long as we're mentioning things for new Phantom flyers to be aware of, here's another:
Although DJI states that iPhones are compatible with DJI Go, the mobile device holder of the remote control is made for larger devices. You can't mount an iPhone in the mobile device holder unless you modify it by adding shims of some sort. The minimum width that a mobile device can be and still fit the mobile device holder is 96 mm, according to my measurements. iPhones range from 59 to 78 mm wide. There are likewise Android devices which are compatible, but too small to fit.
I may be missing what you are saying, but, just flip down the two phone holder arms on the device holder for phones.