Uninstall unused applications: Open Settings, select General, and then select iphone storage space. If there are unused apps in the iphone storage space, you can also choose unused and clear the app cache: Take WeChat as an example, go to Settings, click General, click Storage Space, and click Clear on the right side of the cache. Turn off SMS saving: I suggest you turn on iPhone Settings-Messages-Save Messages, where you can freely set the length of SMS saving, and the expired SMS will be automatically cleared.

IOS is a mobile operating system developed by Apple. Apple announced this system for the first time at Macworld conference on June 9, 2007. The system was originally designed for iPhone, and later applied to products such as iPodtouch, iPad and AppleTV. IOS, like Apple's MacOSX, is a commercial operating system similar to Unix. Originally this system was called iPhoneOS. Because iPad, iPhone and iPodtouch all use iPhoneOS, it was announced at the 20 10WWDC conference that it was renamed as iOS(iOS is a registered trademark of Cisco's network equipment operating system in the United States, and Apple's renaming has been authorized by Cisco).