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I'm not sure how that is doing it natively. You are installing an app too.
There is another alternative that is truly native. Create a contact, I call mine "ignore", and add any phone numbers you want to 'block' to that contact (I haven't found a limit yet if there is one). Then set that contact to 'send calls directly to voicemail' in the contact options menu.
I know it's not truly blocking calls but my phone never rings for those callers but I can still see when they called in the call log if I want to. I use Google Voice for VM so I can easily delete and not have to listen to any VMs they might leave.
Google Voice (while not an app) is my method of dealing with unwanted callers. They can go straight to voicemail (with no VM notification and the VM automatically deleted, IIRC) or end up with a number not in service message.