Making Cents: Buddy, Can You Spare a Phone Card?

Seen those proliferating prepaid phone cards? The photos and artwork on many of them have created a collectibles market. Although some thought it might be a fad, the American Numismatic Assn.--the coin and money collecting people--is treating it seriously. Foreign cards have long been sought-after. Collectors prefer cards that have never been used, although that isn’t always knowable.