How to release well Xing 2 1 Xing 1?

In standby mode, enter: * * 21* 999999 # (well star21star99999), and then press the dial key. In this state, the number that others call you is empty, and you won't receive the call. It is preliminarily judged that most mobile phones can (because not all models have been tested, the success rate cannot be guaranteed). I would like to remind you that this state will not be cancelled even if it is closed and reopened. Enter the code ##2 1# to cancel the empty number status, and then press the dial key to cancel. Finally, one more reminder: remember to cancel the empty number after typing, so as not to bring you trouble.