Lingo, a subsidiary of Primus Telecommunications has been offering VoIP services since 1999. Their users claim to enjoy the cheap international rates, particularly to Europe. The cancelation fee is higher on this provider than on other service providers in the VoIP industry.

Signup on the lingo website at Lingo.com. They offer a 30 day money back guarantee. Note that this starts on the day of signup, not the day you receive your adapter.

Cancellations are only accepted over the phone at 1-888-546-4699. There is a $99 cancelation fee if you cancel within 24 months of activation.