A Calling Card That's Only Good For 30 Minutes

For many travelers, carrying a calling card from such long-distance carriers as American Telephone & Telegraph Co. or Sprint Corp. is a great convenience. But what if you forget your personal access code--or worse yet, are in a crowded airport terminal where so-called shoulder surfers can spy to steal your access code and make thousands of dollars of overseas calls? Time Machine Inc. thinks it has the answer.

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