One situation I don’t understand is an 800-number coming up on my caller I.D. with the name Unknown, and I assume it’s a telemarketer, but it turns out to be a legitimate business call. Why don’t the companies associate their names with their 800-numbers? The reverse phone detective could help you distinguish legitimate 800-numbers from telemarketers, so that you know next time whether to pick up the phone or let the answering machine take the call. You can’t always assume an answering machine message will clear everything up, because even people making legitimate calls don’t always leave messages. Sometimes, they just hang up and leave you hanging, too.