From 2025 to 2026, multiple licensed local Mexican A2P aggregators reported that Telcel, AT&T and Movistar—the three network-owned operators—apply significantly different risk control standards for cross-border A2P SMS. Industry research articles published by Latin American telecom specialist media Mobile Time Latinoamérica and Telesemana fully verify the filtering characteristics of each operator.
Among the three, Movistar enforces the strictest baseline interception thresholds. It has tightened verification for bulk SMS traffic originating from overseas IP addresses, and cross-border A2P traffic such as verification codes and transaction alerts is most likely to trigger risk screening. Due to Telefónica’s sale of its Mexican business, existing risk control rules remain unchanged for the time being, yet the new shareholder may adjust interception policies in the future.
AT&T Mexico continuously optimises its intelligent risk control models for anti-fraud and anti-spam SMS. Its filtering thresholds are frequently tightened dynamically and modified irregularly. Even cross-border traffic with identical sender addresses, message templates and concurrency levels shows fluctuating delivery rates across different time windows, leading to a relatively high risk of false interception for overseas-originated traffic.
For contracted and registered legitimate A2P aggregators, Telcel maintains the most stable risk control policies for OTP verification codes and transaction alerts, with rare ad-hoc threshold adjustments. Its compliant channels deliver better service stability compared with the other two operators.
Industry media offer consistent operational recommendations: when connecting to any operator’s wholesale channel, enterprises must deploy a real-time delivery rate monitoring system and continuously collect SMS delivery receipts upon launch. Contact the operator’s Wholesale department in advance to activate dedicated appeal channels for false interception. If large volumes of messages are blocked, submit message samples, corporate credentials and registered Sender‑ID documentation to apply for manual review and lift traffic restrictions.
