Peace be upon you, and how do you do?.

However, I heared stories about such a thing, and even happend to me when I tried to call some one, yet the line was always unavailable.

Nevertheless, I don't know why this kind of service in the system, as it's a bad kind of service.

Although, why to block your sim from other callers?. In the other hand, if you were busy or out of country, then just turn off the device!.

Take care and may God bless you.

Best wishes and enjoy the service.

*RED