Unlock iCloud service removes an Apple ID request (find my iPhone) from an iPhone device. If you to remove iCloud, because you don't know any login information like e-mail or password this is the service for you. Find my iPhone is a blockade for iPhone activation which prevents other people to use your stolen or lost iPhone or iPad.
Only models that aren't asking for a contact with the owner are supported. For example if any of the following messages appears on the screen:
LOST, Erased, or It's Jola, I want my iPhone back, don't make an order, this type of iCloud cannot be unlocked.
Only models with iCloud Clean status are supported iCloud remove.