Before you purchase an iPhone, iPad or iPod from someone else, make sure that Find My iPhone Activation lock is turned off and the device is ready for you to use.
This tool supports IMEI or Serial Number of any Apple device that can be blocked by Find My iPhone application.
Why is diffrent then iPhone iCloud Check (Activation Lock)?
This service also supports Serial Number. Also, results are not stored in cache. This means that each time you check the device, you get fresh results!