Follow This Steps :-

1) Download Privacy Lock from Here.

2)Create your pattern lock.
 
3)Select the apps which you want to lock.
 
4)Enable all permission for application.
 
5)Now select the App Cover -> Unknown Caller
 
6)Now Click On Finish
 
7) You Are All Set ! 
    
8) Now when someone wants to open any app which you locked then unknown call will come & Then if He answering the call or rejecting a call then also the application will not open at all.

 

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