You could also try jajah.com.I used to use this quite a bit to call a friend of mine in the US.You set up the call via your PC, but the service then calls you back on your land line before calling the other persons phone.Its a great service, and the quality is pretty good.One of the best features is the ability to schedule a call, so you can set the call up whilst as work, and then get it to call when you are back home.