In this article you will find some steps which are to follow in order to protect your personal data in case of theft or loss. Please be aware that the following instructions should be applied only to personal devices (not the ones which were given to you by your employer). In case of a company device you should proceed accordingly to your company’s policy.
Find My iPhone service offers a feature called lock activation (also known as iCloud Lock). The main task of this options is to prevent others from using lost or stolen iPhone/iPad. Lock activation turns on automatically when you use iOS 7 or newer and you enable Find My iPhone on your device.