As long as you can take Live photos with your iPhone you can turn standard snapshots into artsy long exposure shots.
Every iPhone since the 6s has had the ability to take “Live” photos through Apple’s built-in camera. As long as you have the “Live” setting turned on, long exposure stills are only a few taps away.
Take Live photos with the button with concentric and dashed circles on the top of the camera screen. This mode captures the few moments before you take the photo, bringing the still moment briefly to life.