Free international calls to various countries.
Here’s a blurb from TechCrunch on how it works:
Here’s my understanding of how this works: the founder created his own telephone company in Iowa. Iowa is apparently the only state taking advantage of an FCC kickback scheme that gives telco’s a portion of the fees generated from every inbound call to an Iowa number. So when you call the AllFreeCalls phone number, a portion of any long distance fees you are paying go to the company. The kickback is apparently authorized via the Universal Service Fund. These kickbacks are enough on average to more than cover the international outbound calling fees.
I don’t make many (any really) international calls, but my family/friends do. Should be worth a shot. And theoretically since you are calling Iowa and they are placing the call for you, you should be able to dial internationally on your celly without an international plan (and avoid the CRAZY fees that go along with international calls, plan or not).
edit: See comment by Garren below for an slightly more in-depth explanation. I will admit to wanting to try it out though…