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Prepaid phone cards can be very useful for students and others who don't need or can't afford regular phone service. But a recent study of international calling found that prepaid cards can be a shockingly bad deal. Researchers from the University of Georgia, which funded the study, collected data from 20 students who used calling cards to phone Spanish-speaking countries. Calls should have averaged 15 cents a minute, based on the number of minutes printed on the cards and the cards' cost. In fact, their cost averaged 28 cents a minute--87 percent higher--because callers couldn't use the full allotment of minutes.
According to the study, hidden maintenance fees and time lost when calls were rounded off to the nearest time segment most likely ...