How to block a number from my virgin mobile Iphone 4?

I Really need to block a number on my Iphone, its through virgin mobile because i'm a broke ***, but i really need to know how to do this. I would love if someone could help me.

Easiest way is just to make it a DNA (Do Not Answer) Contact and assign it NO Ringer
That way when they call they just get your voice mail and you never hear it ring

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