Next on DoCoMo's Calling Card: The U.S.

With its $9.8 billion stake in AT&T and advisory board of Yankee honchos, Japan's wireless giant appears to be eyeing a chunk of America

Call it Keiji Tachikawa's worldwide wireless adventure. Last year, the intrepid CEO of Japan's wireless-phone giant NTT DoCoMo Inc. spent $6 billion buying up stakes in European and Asian wireless companies. Now he appears to be marshaling his bank account for a full-fledged push into the U.S. Tachikawa fired the first salvo with his $9.8 billion investment in AT&T to grab a 16% stake in Ma Bell's wireless subsidiary.

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