How to silence unknown numbers in iphone

How to silent unknown numbers in iphone. How to Silence Unknown Callers in iPhone. How to mute unknown calls in iphone ************************************************************************************ If you are really interested in my video please follow me on YouTube and Facebook …………………………………………………………………………………………………. Subscribe to my channel:    / channel   FACEBOOK GROUP:   / 411530109484518   FACEBOOK PAGE:   / itmagicsbd   ………………………………………………………………………………………………….. Background music:    / channel