SkypeOut Free US Calls NO GO for IPs 70.x.x.x - 79.x.x.x
Thread on Skype's release page shows a good number of people who are having trouble getting the free landline/mobile US and Canada calling to work. Seems that SkypeOut doesn't like IPs in the 70.x.x.x-79.x.x.x range.
with your OpenID.
If you do not know what OpenID is,