Dolphin Clean is a free iPhone app developed by Dolphin Technology Company Limited. It falls under the Utilities & Tools category and offers a range of features to help you optimize your device's storage space and organize your contacts. With Dolphin Clean, you can easily delete duplicate photos and videos, saving you valuable storage space. The app also allows you to merge and remove duplicate or unnamed contacts, making it easier to manage your contact list. Additionally, Dolphin Clean helps you clear outdated schedules from your Calendar, freeing up even more storage space. The app even sorts large videos by file size, making it simple to identify and delete unwanted files. Overall, Dolphin Clean provides a convenient and efficient way to clean up your device and maximize its performance.