The Apple iPhone 6S Plus picks up sun glare fairly easily. Obviously, you can tilt the phone slightly to avoid the glare, but if you do shoot in to the sun slightly, not only will you get sun glare, but also sun spots.
The sun spots register as green spots and are rather annoying. Now post processing you could mask these if the spot is over some dark background. Just paint over it with the same matching background. Or, tilt the iPhone so the green sun spot is placed right into the sun itself, as per shot below. The end result is quite pleasing.