Mexico's Telmex: More computers could help profits. MEXICO CITY -- Telecommunications giant Telefonos de Mexico SA said Thursday that the only way to continue its gains. Investments expected to increase amid rising competition. Mexico's largest fixed-line telephone company, Telefonos de Mexico SA, said Thursday that it doesn't plan to change its guidance for capital expenditures of eight billion pesos ($619 million) in 2009 even after making heavy investments earlier in the year, accordin...