What should I do if the iPhone displays insufficient storage space?

First, open Settings-General-Dosage. This list shows which items occupy storage space and which items occupy the most space. Click the button on the right side of the list to see the details, and you can also delete some unnecessary items here. Click on the video of the deleted movies and TV programs, and you can see the list as shown in the left figure below. Click the edit button in the upper right corner, and a red delete button will appear, as shown in the picture on the right. Now you can create some space by yourself. Photos and Cameras This list shows the space occupied by camera film, photo library and photo stream, but it cannot be deleted individually. The quickest way to delete photos is to connect to iTunes, import photos and then delete them. Applications lists a long list of applications in the Usage List. Look at the details of these applications and you will find a button to delete them. Delete those applications that you rarely use or don't want to use anymore. Delete other items. In fact, not all options appear in the usage list. Do you know what the color graphics about iPhone displayed on iTunes mean? Generally speaking, the category that takes up the most space here is "Other". So, what the hell is this? In fact, it contains cache, backup, some downloaded files and some data of iOS7 built-in applications, such as SMS and email. So how do you clean up this part? Delete the Web browser cache. The mobile phone will store the webpage in memory, so that the next visit can be faster. If it's been a while since your iPhone, these caches add up to a lot of space. You need to open the settings, click the Safari button, and click Clear History to clear Cookie and data. Delete mail. You can delete a message individually or delete the whole conversation. Usually, some short messages will contain some pictures, audio or video files, and some space will be recovered after deletion. Delete email attachments. Usually downloading e-mail files takes up a lot of space. The solution to this problem is to delete the email account. The specific operation is: Settings-Mail, Address Book, Calendar -iCloud, and then scroll down to the last click to delete the account. Of course, it should be noted that before deleting, make sure that you remember the password of the email account, because you have to add it again. During this process, all attachment files and mail caches that you downloaded and opened will be cleared. When you add an account again, these files can still be downloaded whenever you need them. (This method is applicable to most account types, except POP3 accounts). Delete voice memos, music files and electronic books. Audio files and e-books also take up a lot of space. You should also consider deleting these files in voice memos, iBook and music applications.