You're talking about phone calls. Lately, I've been getting in my e-mail notifications that my message could not be sent. Either the number was unavailable or there was no pick-up at the mailbox, etc. These were for e-mails that I didn't request. The ads had a line at the bottom where you can unsubscribe, which I did and then would get the message that it was "undeliverable". So, I think it's meant to let you think you are unsubscribing but you're really not. This is really a pain. Anyone else had this problem?