With iOS 16, Apple introduced the “Duplicate detection” feature and tests suggest it works like charm. Your device will now easily detect and store all duplicate photos in your library under the Utilities section in Photos. This has been possible due to on-device machine learning on ‌iOS 16‌ and macOS Ventura. If your device is running on iOS 15 or older, you can’t leverage the benefit of this feature. You have to go with the traditional method of spotting and removing duplicate images from your iPhone. To streamline the process, you can use third-party apps like Gemini Photos, AOMEI Mbackupper, etc.