It's free to use, they're are no monthly fees or registration fees, you simply add the number to your existing dialup accounts and off you go. It's a local rate number so the calls should cost no more than a 1p a minute and even less if you add the number to your BT friends and family list.

All you have to do is make a new connection in your networking/dialup folder in 'my computer'.

Add the number: 0845 0501718
The user name is net and the password is factory.