AT&T Corp., which stormed into the credit card industry seven years ago with an aggressive new style of marketing, abruptly announced plans on Monday to withdraw from the field.

The telecommunications giant is putting its $14.2 billion card portfolio on the block as part of a broad plan to refocus on core businesses. The portfolio, the seventh-largest in the industry, would likely command a premium of about 15%, or $2 billion, observers said.

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