América Móvil's Telcel lost 2 percentage points but still leads the market with over 60% in share, says The CIU.
Chile is so far brushing aside US concerns about the Chinese telco and lobbying for the investment, while Argentina and Brazil are also on the table.
In a previous preliminary decision, the Brazilian regulator had approved the acquisition of DirecTV's operations in the country through its subsidiary Sky Brasil.
The QR- and NFC-based is being touted by the Mexican banking sector as a way to reduce fees and transactions costs.
The Brazilian insurer has raised the different areas in charge of digital transformation to vice-presidency status.