Clean up the photos
In most iPhone users' mobile phones, the first thing that consumes memory is photos. Therefore, in order to clean up the available space, we first need to move the knife on the photo. Because it is very easy to take photos on the iPhone, we may have many meaningless photos stored in the iPhone, such as screen shots and random shots. These photos have all been deleted. Then, we can use iCloud or other cloud services to save the photos in the cloud, and then clean up all the photos on this machine regularly.
Clean up some memory-consuming applications.
Go to Settings-General-Use, and we can check the space occupied by each App. Kill those apps that take up the most space, and don't leave some apps that are not commonly used! In addition, instant messaging applications, such as QQ, WeChat, etc., will accumulate cache files for a long time, and the size will increase with time. If you want to clean up their cache, you can only uninstall and reinstall. I once uninstalled a QQ with more than 1G, and it was only 80M after reinstallation.
Clean up the browser Safari cache
Apple's built-in browser requires special skills to clear the cache. Click Settings -Safari- Clear history and website data, which can save some free space on the iPhone.