The idea is to minimize incorrect information. A 555 number at least tells you something that a number in an unfamiliar format doesn't - whether this was inten

The idea is to minimize incorrect information. A 555 number at least tells you something that a number in an unfamiliar format doesn't - whether this was intentional or mistyped. I'm very much for allowing people to enter any format, but seeing how badly people mis-enter NANPA phone numbers, it is simply wrong to not acknowledge that you will see far more mistakes from an open input box.