There are two business models on the internet - paid and ads. Google doesn't charge you for using their search engine, Yahoo doesn't charge you for getting your question answered. I'm not saying that I'm sure that dialinfree is legitimate, but it certainly could be, and from what you say (no bill), it sounds as if it is. I'd print the pages that claim that there are no fees or charges, just in case, but I wouldn't worry too much.