According to Osiptel, Bitel took too long to file a subscriber update report.
Mexico shows "acceptable" levels of digital maturity, ranking 55th of 151 countries studied, but its government underspends on digital policies.
Paula Arregui, product director for MercadoPago in Latin America, said certain aspects of Mexico's fintech legislation represent major barriers for new and small players.
The company, part of Cobalt Broadband Services, offers backhaul fiber optics services to the Mexican tourist destination's hotel industry.
Mobile operators will have five months to make the necessary adjustments to their networks and identify the calls.
The country's regulator reported that in Q3 more customers complained about AT&T's services than about Telefónica's and Telcel's combined.