The iPhone can't take long exposure photos out of the box. Apple hasn't added the functionality to the default Camera app. But third-party applications will let you increase exposure and capture time.

For iPhone 13, ‌iPhone‌ 13 mini, ‌iPhone‌ 13 Pro, and ‌iPhone‌ 13 Pro Max users, iOS 16 adds new Camera app functionality. On its iOS 16 website, Apple says that there are two new ‌iPhone‌ ...