1. First, delete unnecessary data and applications: Intelligent Manager (memory manager)-storage space/memory. Close unneeded applications: click the recent task key in the lower left corner of the screen-click the "X" in the upper right corner of the application to be closed/close all the applications below.

2. Secondly, if the mobile phone supports memory cards, move the multimedia files to an expansion card or set the shooting storage path as an expansion card. If you don't have a memory card, transfer multimedia files to your computer regularly.

3. Finally, uninstall the software or files that are not commonly used.