Automatic keypad unlocking device for mobile telephones operated on the basis of several key inputs set to lock or unlock the keypad

摘要

The electronic device such as a mobile telephone has a key pad with several keys. The key pad has a locking function. When this is activated, this locks the key pad against unauthorised or undesired input operations. The keyboard can also be unlocked. The keyboard is unlocked when a predetermined sequence of keys is pressed. The length of time a key is pressed can also be taken into account.