I was shown this site the other day. It's already saved me money. I have a contract for my mobile that gives inclusive minutes and a similar deal on my landline. When I want to ring frephone numbers, I cant use my mobile minutes and when it isnt an 01 or 02 number, I cant use my landline minutes. You type the number in the box and it gives a list of alternative numbers to reach the same company. It worked with British Gas and NTL so far.