The Mexican Supreme Court of Justice (“SCJN”), in a plenary session held on April 25, 2022, discussed the unconstitutionality actions 82/2021 and its accumulated 86/2021 (the “Actions of Unconstitutionality”). Such actions were filed by the National Institute of Transparency, Access to Information and Personal Data Protection (the “INAI”) and by some members of the Mexican Congress against the amendment to the Federal Telecommunications and Broadcasting Law, which created the National Registry of Mobile Telephony Users (the “PANAUT” or the “Decree”), published in the Official Gazette of the Federation on April 16, 2021. The following is an analysis of the most relevant issues of such discussion and its consequences.