Method 1:

Download a "360 Mobile Guardian" software in the Apple Store.

2. Open "360 Mobile Guardian" and click on the mobile phone to slim down, which will automatically start scanning.

3. Click "View Now" below to delete some unnecessary videos and photos.

4.？ After cleaning, you can see the change of available numbers.

Method 2:

Double-click the Home button below the iPhone to open the background running bar, slide up to delete some unnecessary running software in the background, and press the Home button to reply when finished. Deleting background running programs will help improve the running speed of iPhone and save electricity and traffic.

2.？ The system used by iPhone basically won't leave too many junk files, but if it is found that iPhone is occupied by junk files, it is recommended to refresh or upgrade the system correctly to remove the junk.

3.？ If your iPhone has not been turned off, there is another way to clean up junk and redundant files, which is to restart the phone, which is very important for regular maintenance of the machine.