By Christopher Bjork 

MADRID-- Telefónica SA's retreat from the U.K. market would see the Spanish telecom giant pivoting further toward South America, where it is trying to cement its leading position in another fast-changing market: Brazil.

Telefónica's goal is to become a leaner phone operator focused on only a handful of large markets while chipping away at a large debt load the company had saddled itself with over the past decade.

The Madrid company said on Friday that it was in exclusive talks to sell O2--the U.K.'s second-largest cellphone operator--for as much as GBP10.25 billion ($15.5 billion) to rival firm Hutchison Whampoa, which owns Three, the fourth-biggest operator.

The move would see Telefónica part ways with a business that brought in almost 14% of the group's revenue in the first nine months of the year and will leave it more exposed to volatile Latin American markets, which already bring in more than half of its sales and profits.

Through deal making, Telefónica has become the leading provider of cellphone subscriptions in Brazil, while it also controls big operators in other markets on the continent. While the economies there are considered more risky, phone and Internet providers are also growing faster in these less mature markets.

But it also allows the company to address a nagging concern among investors--a debt load of more than EUR40 billion ($46.2 billion)--which the company said it plans to lower with the proceeds from the U.K. sale.

Telefónica was in a sticky situation in the U.K.

Rivals have started to offer consumers packages of high-speed Internet, cellphone connections and digital television, leaving Telefónica's cell phone-only offering lacking. One option, which the Spanish company also had considered, was to seek an alliance with a company that could give it access to TV and broadband. Telefónica in recent weeks met Sky PLC to discuss ways of cooperating, people familiar with the matter said.

The other option was to sell.

Investors applauded Friday's announcement and sent Telefónica's stock up more than 3% in afternoon trading in Madrid.

"We think a complete exit from the U.K. in an all-cash transaction is the best option for Telefónica," said Javier Borrachero, an analyst with Kepler Cheuvreux in Madrid. Mr. Borrachero said the sale would move Telefónica's debt levels down to where the rest of the sector is, as well as allow the company to keep paying a generous dividend.

Analysts at Citigroup said the debt reduction the potential deal brings makes Telefónica's turnaround process "more credible." It said the alternative for the former Spanish phone monopoly would have been either to cut its dividend or raise cash through a capital increase.

Telefónica bought O2, which included assets in Germany and Ireland, in 2005 for GBP17.7 billion. It has sold off chunks of the business over the past two years to pay down debts and fund acquisitions in Brazil and Germany. Hutchison bought the company's Irish assets and Telefónica has also sold part of its German unit in a public offering. All in all, the investment has been a profitable one for Telefónica, said people within the company.

The U.K. divestment comes as Telefónica is doubling down in Brazil, which already is the largest contributor to its earnings. The phone giant last year cemented its position as the dominant telecommunications firm in Latin America's biggest economy with a EUR7.24 billion takeover of broadband and cellphone operator GVT.

But cash from the sale of O2 may also come in handy over the coming year as consolidation in Brazil continues. Analysts expect the number of Brazilian cellphone operators to shrink further, from four to three, with Telefónica playing a role.

Two smaller rivals, Brazilian phone operator Oi SA and the local unit of Telecom Italia, TIM Participações, have both signaled an intention to make a bid for each other's operations, and Oi recently discussed joining forces with Telefónica and the fourth operator, Mexico's América Móvil SAB, to make a joint offer for TIM.

HSBC and Moelis are advising Hutchinson on the acquisition. UBS is advising Telefónica.

Write to Christopher Bjork at christopher.bjork@wsj.com

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