--Mexican billionaire says market share reflects consumer preference

--Some lawmakers, officials want America Movil excluded from 4G auction

--Slim says exclusion would deny new technology to 29.5 million users

By Dan Molinski

BOGOTA--Mexican billionaire Carlos Slim, on a visit Friday to Colombia, rejected claims by lawmakers in Bogota that his telecommunications firm America Movil SAB (AMX, AMX.MX) needs to be reined in and regulated because it has gained too dominant a position in the country's wireless sector.

America Movil is Latin America's biggest wireless phone service provider, and the company's third-largest market is Colombia, where it commands a 60% market share, while a couple of competitors including Spain's Telefonica SA (TEF) share the other 40%.

"In terms of a monopoly, in any economic activity in which two or three firms are competing, one has to be bigger than the other," Mr. Slim told reporters at the seaside, colonial city of Cartagena. "The fact that one [company] has a bigger share is a result of customer preference."

The debate over America Movil's share of Colombia's wireless market--it had less than 50% of the market when it arrived in Colombia at the end of the 1990s--has become a hot topic recently as the government prepares to auction spectrum for fourth generation, or 4G, mobile service. These 4G licenses will allow smartphones to work faster and sound better.

Some Colombian lawmakers and government officials want America Movil to be excluded from the auction as a way of regulating the industry and reducing what they say is Mr. Slim's near-monopoly control of Colombian wireless industry.

Mr. Slim said if the Colombian government excludes his firm from the 4G auction, it would hurt the country's reputation as a supporter of free markets and competition.

"There have to be clear rules in these countries," he said. "I don't think [excluding America Movil] is an alternative because I don't believe 29.5 million customers [America Movil's share of Colombia's 47 million wireless users] should be denied access to new technology."

Officials weren't available for comment at Colombia's Ministry of Information and Communications Technology, which is overseeing the 4G bidding round, expected to take place in the first half of 2013.

America Movil's chief executive, Daniel Hajj, addressed similar concerns about the firm's position in Colombia during a conference call with analysts Friday morning.

"What you need is investment, and to have those investments the country needs certainty, legal security, and if you have those things then the investments are going to come," he said.

Mr. Hajj also criticized unnamed parties who, he said, would seek to increase their market share in Colombia through regulation rather than investment.

America Movil's main competitor in Colombia, Telefonica, which operates under the local brand name Movistar, has less than a 30% market share. It is also partially owned by the Colombian government.

Other America Movil competitors in Colombia include Tigo, owned by Luxembourg-based Millicom International, and Empresas Publicas de Medellin, or EPM, a government-owned firm that operates under the brand name UNE.

UNE has a tiny market share, but is the only wireless firm to have already flipped the 4G switch in some parts of the country.

--Anthony Harrup contributed to this article.

Write to Dan Molinski at dan.molinski@dowjones.com

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