Because I could totally give it to you right now and it would not help you the tiniest bit.
I am typing this at uni because my home internet is down again. This time it's through no fault of our internet people. Somehow - and I really have no idea how this happens - our phone number is not our phone number at the moment.
Basically, we can call out, but the number that will show up is not ours.
Crap! Does this mean mean that someone else has our phone number and could be ringing up our phone bill as I type? That's not cool, other people.
WAIT A SECOND.
If we have someone else's phone number, I could be ringing up their bill right now. I could call Asia, Europe ... oh wait. I could call YOU.
Wait by the phone, bitches.