Incoming Call Lock is a great call-blocking app. You can select a number or name to block and also set a password to make it more secure. You can even set the screen to appear when you receive a call, and then you can choose to answer it or not.

This is a must-have app. It will protect your phone's incoming calls from being seen by anyone else. It will also allow you to see who is calling and what number they are calling from, even if you don't have your phone number saved in your phone.

This app will not allow anyone to see the caller's number, name, or any other details. It will give you the flexibility to use it as per your instruction.