They could be PG scams. Perhaps the girl is too busy to answer the phone - please form an orderly queue and wait your turn!
It could be a 'number harvesting' profile or perhaps the girl's 'manager' had posted the profile up without actually checking she was there.
I called a girl 2 or 3 times a few months ago that was advertised as being local to me but got no answer.
I tried the next day and finally got an answer and said I was interested in seeing her. She apologised for not answering the previous day but said that she hadn't then actually left the previous place some 100 miles away and so wasn't answering the phone because of that!