[header] How to clear iphone memory [title] Look for the sleep/wake and the volume buttons. [step] The sleep/wake key-the one that you use to lock and unlock your iphone screen-can be found on the top side of your iphone. The volume keys can be found on the left-hand side of the device. 
[title] Press down the sleep/wake and the volume keys. [step] Keep your fingers pressed on the two buttons for at least 10 seconds or until the screen shuts off.