"The result in low-light situation is astounding when compared to the iPhone’s predecessors and almost all of its smartphone competitors. That doesn’t mean your photos will be perfect. Washington, D.C.-based photographer Brooks Kraft tells us, for example, that inside the Capitol, as he followed Pope Francis’ visit, he had difficulties capturing movement, resulting in images where the main subject was blurry. (The iPhone has a tendency to keep ISO low, even in low-light situations, as it favors fast shutter speeds to prevent motion blur.)"
That line about the low ISO doesn't make sense, in a low light situation a higher ISO would result in a faster shutter speed.