Mexican media giant Televisa said Monday it has agreed to buy 30 percent of cell phone carrier Nextel de Mexico for $1.44 billion as part of its plan to offer “quadruple play” — voice, video, Internet and wireless products.

Two of Mexico’s most powerful businessmen are set for a new round of head-to-head competition as the country’s television

The companies plan to bid together on wireless airwaves in a government auction planned for May, and the investment is subject to winning the auction and Nextel getting the spectrum to broaden its services.

“If the proposal we present in the auction is not successful, then we don’t do the deal,” Alfonso de Angoitia, Televisa’s executive vice president, told reporters on a conference call.

Grupo Televisa S.A., the world’s top producer of Spanish-language television programming, will have the option to buy an additional stake of 7.5 percent, the company said in a statement earlier Monday.