Unitec offers International Callback Services for cheap phone calls to all regions on earth. Callback is a unique innovation designed to provide low U.S. international long distance rates to countries outside the United States. Using Callback Service, you can save up to 80% on your international phone bill. Two-tier program pays from 7% to 17% first tier and from 1% to 3% second tier commission, depending on the monthly total group commission. A cookie will be written and when the visitor comes back for up to one year the affiliate will be credited with the sale. Recommended by Juergen Preusse..