I KNOW there's a number.......I remember using it years ago. You dial it and an automated voice will tell you the number you're calling from. Here's why I ask. Our phone line is dead. Our DSL (on the very same line) is still working, but we get no dial tone with any of the phones in the house. We've done all the tests.....and have determined the problem is NOT within the house. Now, a few years back, we had a second line installed, but we didn't keep it active for long and canceled it. But when we hooked a phone up to it just for the heck of it (since this problem started), we got a dial tone. We don't want to use that line if it's not ours (it's supposed to be disconnected). So, does anyone know that number you call to get the automated voice telling you the number you're calling from?