iCloud unlock for iOS 7 locked devices
Everything you need to know about iOS's activation lock is described in this page. As far as we are concerned there is no public way to fully bypass Apple's activation lock. Every method you find on the web will probably take your money and leave you with a half working iDevice.
1. Which devices can be locked using the iCloud activation mechanism?
This is easy, all iDevices that are running iOS 7 or later can be iCloud locked by enabling the "Find my iPhone" feature in the Settings menu. If you have an iDevice running iOS 6 or older, you cannot secure the device.
2. Who can disable this iCloud activation lock?
The iCloud activation lock can be disabled only by its owner by using his AppleID to turn off "Find my iPhone".
3. I heard about hackers bypassing iCloud's activation lock - the duolCi servers
You heard right, but that kind of activation has some issues. First of all, it's illegal. Second if you do activate your iDevice using duolCi, you'll get not cell reception and some other features will not work.
4. Is there anything I can do if I have an iCloud locked iDevice?
Sure, you can return it to its rightfull owner. If that's not an option, you can buy a used motherboard that does not have the iCloud activation lock enabled. Or, just take it apart and sell it for spear parts.
iCloud activation lock cannot be bypassed!
If you're interested to read more about Apple's Activation Lock, here are some articles we wrote a few months ago:
iOS 7 Activation Lock
Removing an iDevice from a previous owners account