Why check your iCloud lock before buying a used iPhone?

Checking my iPhone (activation lock) is one of the most useful features of our IMEI check.
We strongly recommend you to verify Find My iPhone status if you’re going to buy a used Apple device. If the Find My iPhone feature is turned ON, iCloud activation lock is also activated. This means that the device still does not belong to you, so you will not be able to activate this iPhone / iPad and use it properly.