In addition to the long exposure setting, the iPhone also has a nice "portrait" setting that uses its depth camera to blur the background. A normal camera does this by having a large aperture lens. The iPhone has a wide aperture (f/1.66), but because the lens is so physically small (6.9 mm), it's difficult to get a shallow depth of field so that the background blurs. The camera knows where, in terms of depth, the subject is, and the distance to everything else in the scene, and it uses the depth information to artificially blur whatever is not in the same plane as the subject.
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