If I block someone's number from my iPhone, what happens if they text or call?

I know I won't receive any messages or calls BUT will they know? Will it come up my phone has been deactivated or just bleep or fail to send or something? I want to know because I want to know if they will know I have blocked them or think I'm ignoring them.

You won't even know.

They will get a dialling tone that will just ring out until they hang up. They will think their text's are going through but won't actually get to you.

If you blocked any person then his mobile phone show call not connect and msg not delivered.