Back in the mid-nineties I saw one of those phone card girls. Obviously she wasn't the girl in the photo, but she was fairly pretty, Australian and mostly friendly. I paid for half an hour, but she did her best to get me off as quickly as possible, and being fairly inexperienced back then I was out of the door after 15 mins. So I never bothered doing that again.
Anyway, as others have said, we've got the net now and a wealth of resources, so I really wouldn't bother with them.