This is something that really gets me pissed. Last year, my teenaged daughter became acquainted with what turned out to be a total loser who lived across the country (fortunately!).
I went around the roses with Verizon on this simple request: I wanted them to place a block on my daughters line so that she could not make or receive calls that originated in the scumbag’s area code.
Their customer service people informed me that this was impossible, they could either block ALL outgoing/incoming calls, or none at all. Totally asinine in my opinion, but hey, we are talking about Verizon Wireless, hehe! This situation kind of cleared itself up once I had personal chat with the dickweed, but I wonder if the rest of the carriers are like that too?