For the cost of listening to one or two audio ads, 20 seconds or less each, you can make a free international phone call. It only lasts 10 minutes, but for certain types of phone users, that’s more like a feature than a restriction. And it actually works.
The hardest part of using FreePhone2Phone is likely entering in the international and area codes to complete your call. Find your local access number on FreePhone2Phone’s site, dial it, listen to an ad, enter your number, then (perhaps) listen to one more ad. Then your call is connected, and that’s about it.
FreePhone2Phone is, as you guessed, free to use in the U.S., with advertising. Only a few countries allow for calling cellular phones, but most land line numbers are free to call. Calling the same number twice in one day also cuts the call limit to five minutes.