Abstract: In method for unlocking an electronic device, a connection between an electronic device and a separate locking device is established. Identity information of the electronic device is obtained by reference to an identity card in the electronic device. The identity information is stored in a storage device of the electronic device. When the identity card of the electronic device is determined to have been changed, the electronic device is locked. A determination as to a new identity card being arranged in the electronic device can be made. Identity information of the new identity card is read and determined as being the same or not the same as the identity information stored in the storage device. When the read identity information is same as the identity information stored in the storage device, the new identity card is validated and the electronic device is then unlocked.