1. To clear the iPhone memory, press the "Home" back key twice to open the background multitasking management.

2. Next, in the background application management interface, you can see that the application will be displayed in the form of cards.

3. In the background, use your finger in the application card bar, slide up, and throw out the application to make it exit the background of the mobile phone system. If you have many applications open in the background, just close them in turn.

Method 2: Release the storage space on the mobile phone.

1. Open the Settings application on the screen.

2. Find the "General" column in the list of settings, and then click Enter.

3. Next, please find the "Dose" column in the general list, and then click Enter.

4. Then find the column "Manage storage space" in the usage list and click Enter.

5. Next, you will see all the installed applications on the mobile phone, and the system will arrange them from big to small according to the size of their occupied space. Select the application to delete from the phone.

6. Then click the "Delete Application" button.

7. Finally, click the "Delete Application" button and confirm the deletion, so that more memory storage space can be released.

Method 3: Use the third-party tool cclean.

1. Take "Synchronization Assistant" as an example. First, download and install the Synchronization Assistant tool on your computer.

2. Connect the iPhone to the computer through the data cable, and then open the Synchronization Assistant. After that, the tool will automatically identify the iPhone. When connecting the computer for the first time, you need to install the iPhone driver, and then click the Clean Garbage button behind the bottom capacity to clean up the cache.

3. In the next prompt interface, click Clean Now.

4. Next, the synchronization assistant will scan the junk files in the iPhone. After the scan is completed, you can see which cache garbage can be deleted. The default is the recommended cleaning project. You can also choose which ones to clean, and finally click Start Cleaning in the upper right corner.

5. When the cleaning is completed, you can finally see how many junk cache files the synchronization assistant successfully cleaned for your iPhone.