How to clear all the information in iPhone?

Just restore the phone to the factory settings. Take the iPhone 7 as an example. The specific method is as follows:

Step 1: Click the "Settings" icon on the phone desktop, as shown.

Step two. Select the "General" option in the setting interface of the mobile phone, as shown in the figure.

Step 3: Open "Restore" in the common interface, as shown in the figure.

Step 4: Click "Restore All Settings" in the restore interface, as shown in the figure.