Illegal use press power off solution on china
1.Please go to phone security setting and deactivate theft proof icon.
2. it is usually RED -when activated. usually is password protected by user and usually happens when other sim card inserted in the hand set (i mean a differnt sim card not one present in the set when the password was put].
3. what you can do is read the password using box or request owner to give the code then deactivate or format set...