Telephone Callchecker from the Money Saving Expert

This website is aimed at consumers and is a big hit in the UK for people wanting to save money. This section of the website is extremely useful for businesses as well as residential as it gives the cheapest dialler numbers for dialing either Internationally or UK numbers - whether geographic numbers or not. A lot of these services are actually cheaper than Skype and a lot of other VoIP services, so you can save lots of money when used regularly. If your telephone is programmable (or you use a mobile) it's even easier to save. And go for the green numbers, as you do not have to sign up or do anything to use them.