If you block their number?

I have an IPhone 5S and today I decided to block someone's number, I don't really want the person to know I've blocked it as it's slightly awkward and will probably create a bigger argument and more stress, so I was just wondering if people know if you block their number? Like, does it come up with a message when you text them or something? I'd really like to know!

The way it works if they try and ring you they can't get through by text or call and No they should not know

They will get the hint when all there calls go directly to voice mail on the blocked number, but don't if they call from a different number. And most people that know you, if the get blocked, will in fact try other numbers to see if they can get through.

As far as text, most won't know, they will think you are busy, didn't get the text, or are ignoring text. But if this person knows your other friends, and they talk to them and find out that you have been texting the other friends around the same time of day that the were also texting you, they will know you are ignoring or blocking them. So depending on their smarts and how invested they are in whatever the drama is, you may very well get that argument you are trying to avoid.