Mexico's Unanswered Message for Carlos Slim

Carlos Slim didn't become the world's second-richest man by being an easy target. So it's probably a mistake to think the Mexican telecommunications mogul and controlling shareholder of America Movil SAB won't try to sidestep Mexico's ambitious reforms meant to bring monopolists to heel.

Consider America Movil's refusal to obey an order by Mexican regulators to share its network with rivals and sell unblocked mobile phones to consumers. Denying competitors access to its fixed-line network and making it hard for consumers to switch carriers is one of many tactics the company uses to protect its dominance.