Do you want to ignore someone who is repeatedly calling you but don’t want to silence your entire iPhone for other potentially important calls? There’s a simple solution: assign a silent ringtone to the annoying caller. When that person calls, the silent ringtone will play, meaning you won’t hear anything. You can download a silent ringtone by right-clicking on the link below.
Next, you need to add it to iTunes and sync it over to your iPhone. Then, assign the ringtone to the contact (instructions here). You may have to first create a contact with the person’s phone number.
Also make sure to turn off vibrate for calls in the iPhone’s Settings.