It's a scam, they will call you everyday with the same story, they say they're US Local on-line Yellow pages. In fact, they have nothing to do with real Yellow Pages. They promise you a free listing but once you agree to that they will start sending you invoices. They somehow try to get you say "Yes" to some tricky question and then they claim you agreed to purchase their servises. I posted a link in one of my earlier messages, you can read all about this kind of scam there.

They stopped calling me. Last time they called me I wrote down the name of their business (I asked the person twice to make sure I wrote it down correctly) and then when she started with her story of "free listing" I interrupted her and asked her what the address of their business was. She said she needed the address of my business, I said I needed the address of hers first. She said she was not allowed to disclose that and she hung up. I never got any more phone calls from them. I am not sure if they got scared I was some kind of investigator or something but after this they really stopped and I haven't heard from them for about week now.