By Matthew Cowley

SAO PAULO--Brazil's antitrust agency on Wednesday threw a spanner in Spanish telecommunications company Telefonica SA's (TEF, TEF.MC) plans to take a larger stake in European rival Telecom Italia (TI, TIT.MI) on the grounds that it would harm competition in Brazil's mobile-phone market.

Telefonica opted earlier this year to increase its stake in Telco, a holding company that owns 22.4% of Telecom Italia. As a result, Telefonica will take effective control of the heavily indebted Italian firm early next year.

"Either Telecom Italia sells TIM in Brazil, or Telefonica must leave its stake in Telecom Italia," CADE President Vinicius Marques de Carvalho said in a statement.

Telefonica and Telecom Italia each control the nation's two largest mobile-phone companies, Vivo and TIM Participacoes SA (TSU), respectively. At the end of October, Vivo had 77.4 million customers, equivalent to 28.7% market share, and Telecom Italia's TIM SA had 73.2 million customers, or 27.1% share.

A spokesman for Telefonica in Brazil said the firm is evaluating CADE's decision.

Telecom Italia has consistently ruled out selling its Brazilian division, which accounted for 26% of the firm's revenue through September.

Meantime, Telefonica was also fined 15 million Brazilian reais ($6.35 million), while TIM was fined BRL1 million. CADE said that the purchase of additional shares in Telecom Italia by Telefonica had contravened a 2010 deal signed between the companies and CADE to avoid a conflict of interest. In April 2010, Telefonica agreed to a series of commitments with CADE to be able to buy its original minority stake in Telco.

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