http://www.snopes.com/business/taxes/excise.asp
Short version (Snopes won't let me copy/paste)
You're getting between $30 and $60 back depending on marital and kid status if you have had a phone line between 2/28/03 and 7/31/06 you're [most
likely*] getting a refund.
*it doesn't specify if you needed to have made long distance calls in that time.