Top executives are gathered in Barcelona for the annual Mobile World Congress.

Following are Tuesday's top stories from the conference, which concludes Thursday.

KT CORP. (KT) plans to make a final decision "within weeks" on the purchase of a 20% stake in struggling South African operator Telkom SA Ltd. (TKG.JO), a top KT official said.

KT is currently completing due diligence ahead of the deal, Pyo Hyun-Myung, the president of KT's Mobile Business Group, told Dow Jones Newswires.

The South Korean company announced talks to buy the stake in October last year, but negotiations have dragged on since, as KT seeks to expand in markets with growth potential, given the saturated state of its home market. In South Africa, fixed-line users account for 8.2% of the population, compared with 76% for mobile users, according to data from World Wide Worx.

European Commissioner Neelie Kroes issued a stern rebuke to Vodafone Group PLC (VOD) Tuesday after its chief executive Vittorio Colao complained about regulated cuts to telephone rates.

In a statement that she called a "message to Vittorio and Vodafone," Kroes, who is commissioner in charge of the digital agenda, said she is calling the company's bluff and that she doesn't "respond well to threats."

"I take the side of the Vodafone customer... If consumers lose the fear of using their smartphones and tablets [because of lower fees] when traveling across Europe, operators will benefit as well," Kroes said.

TELECOM ITALIA SPA (TI) Chairman Franco Bernabe said the subsidies mobile operators use to attract customers to phone contracts are too high in Europe, and will likely come down in the coming years.

"We are subsidizing our own competitors--that has to change," Bernabe said during a press briefing.

Like other operators, Telecom Italia has been hit by the emergence of mobile apps such as WhatsApp and Skype, which allow customers to send messages and make calls over the Internet for free using their smartphones. The popularity of these services has taken a bite out of operators' revenue.

TELIASONERA AB (TELN.SK) said it will start charging customers for making calls over the Internet on mobile phones as the technology threatens to erode the company's revenue.

As high-speed fourth generation mobile network technology gains traction, Voice over Internet Protocol--a technology enabling Web-based telephone calls--is likely to replace traditional phone calls, TeliaSonera's Chief Executive Lars Nyberg said.

"Eventually, all voice calls will be made over IP," Nyberg told Dow Jones Newswires in an interview.

BHARTI AIRTEL LTD. (532454.BY) Chairman Sunil Mittal said mobile telephone operators need to make a sustained push into the market of international money transfers in India.

India has fewer than 100,000 bank branches serving a population of over 1 billion, while Bharti alone has over 1 million phone stores, with another million owned by other mobile companies, the chairman of the Indian telecoms giant said.

India was the world's biggest recipient of migrant worker remittances last year, with $58 billion sent back to the country, just ahead of China with $57 billion, according to World Bank data. Worldwide, remittances in the developing world topped $350 billion.

"All of this needs to move through mobile networks," Mittal said.

MASTERCARD INC.'s (MA) head of mobile product development said the old-fashioned credit card is here to stay for a while, despite mobile payment services starting to gain traction.

"There will be a period of co-existence for a long while," James Anderson said.

The trouble is it requires a lot of different players to make paying via a mobile phone a success, he added.

TELEFONICA SA's (TEF) German unit chief said smartphones could cost as little as EUR50 in the foreseeable future.

Rene Schuster said he expects some smartphones to be available for less than EUR100 in Germany by next year, adding that the time will come when they cost as little as EUR50, although he didn't refer to a specific country in the latter remark.

-By David Roman, Sven Grundberg and Archibald Preuschat, Dow Jones Newswires

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