6. Utilize New Photo Formats
Photos and videos take up a lot space. On iPhone 7 and up (any device with an A9 chip or better), iOS 11 comes with new formats called HEIF (High Efficiency Image Format) and HEVC (High Efficiency Video Coding), which can compress media about twice as much and still be easily shareable with the outside world. Yes, that’s a 50 percent space saver. To set up the new formats, go to Settings > Camera > Formats > High Efficiency. To stick with JPG file for images and H.264 for videos, tap Most Compatible.