I've never seen my number, but I ALWAYS see area code and exchange.

My business land line run through a FAX machine and quite honestly I only use it for outgoing calls and never get clients (new or old) calling in on it.  So when I see one of those numbers I really know is bogus, I just hit the Answer on the FAX machine.  If it's a large SPAM Call Center I'm just hoping their software drops my number thinking it's a dedicated FAX line.  [Please don't burst my bubble...]