Scott Goldman uses his mobile phone to call friends and business contacts all over the world, from Britain to Australia. But the Southern California-based consultant doesn’t pay a dime in international tolls to his mobile-phone carrier, AT&T, the biggest in the U.S. Instead, Goldman places the international portion of the calls–roughly 100 minutes a month–through a service called Gorilla Mobile that relies on Internet-based technology to route wireless calls virtually toll-free. Goldman, a user of Apple’s iPhone, estimates that he saves hundreds of dollars a year with Gorilla’s service. He stands to cut wireless bills even more by signing up for another, iCall, that’s due for the iPhone in the coming weeks

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