First, to clear the Safari cache, you need to go to Settings -Safari, and then click "Clear History" and "Clear Cookies and Data".

Second, turn off automatic update and download automatically. If the iPhone is stuck when it is in use, it may be because it tries to apply an upgrade in the background, which can be done manually.

Third, download "360 Mobile Guardian" to optimize the cleaning of mobile phones:

1, open the APP Store, search and download "360 mobile phone hygiene"

2. Open "360 Mobile Guardian" and click Optimize to clean up the mobile phone.

3. Slim down your phone and clean up photos and videos.