Goings-on in mexican telecoms are akin to a telenovela. América Móvil, the empire owned by the country’s richest man, Carlos Slim, stars in every season. So it is with the latest instalment of the soap opera. Televisa, a heavyweight of Mexican broadcasting, at&t, an American telecoms group with big operations in the country, and Mexico’s chamber of telecommunications have asked the Federal Telecommunications Institute (ift), the…