Open settings-> General->; Storage space and iCloud usage-> Storage space-> Manage storage space.

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.

Applications, in the usage list, a long list of applications is listed. If you look at the details of these applications, you will find a button to delete them. Delete those applications that you rarely use or don't want to use anymore.

Then there is the simplest way, delete this heavily used APP, and then reinstall it, and you will find a lot of space!

What do you mean by the colorful graphics about iPhone displayed on iTunes?

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 iOS 7 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 the message.

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.