How come my iPhone won't let me block someone?

It doesn't have a button for that or anything?

They used too. A couple of updates ago that option disappeared. I used to use it as well and miss having it

I phone does not have a " Block or Reject " like Samsung have.

It is suggested to download a third party app and install it on your phone.

There's no other way out!

If you call the carrier they will do it.