I started this service last month and it works.

If you have a BT line and you are spending more than £9.99 / month on national and local telephone calls this will save you money.

The only problem I have had is diverting calls to my mobile phone. I fixed this by putting the code 1280 in front of my moble number. The cost of the diverted calls will now be collected by BT. Take a look at their web site and if you decide to give it a try, DON'T ORDER IT THERE. Please quote the number on the card below. The catch here is you save £10 and I get £5 worth of credit and it is a FREE telephone call.
Click here to go to the Alpha web site