The National Commission of Markets and Competition (CNMC) has registered up to the morning of September 10 a total of 13,565 aliases in its official database, in the midst of the regularization process of SMS message identifiers ahead of the mandatory blocking that will come into effect on September 15.
Sources from the supervisor emphasize that the list of senders "moves minute by minute" and that it already totals 13,565 registered aliases.
These same sources remind that, in application of the ministerial order approved in 2025 by the Ministry for Digital Transformation and Public Function, from September 15 telecommunications operators must block all alphanumeric headers that are not registered or that belong to unregistered providers.
In this way, companies, businesses, public administrations, and the rest of the organizations that use aliases as senders in their SMS, MMS, or RCS are obliged to correctly register these identifiers before September 15 if they want to continue using them normally.
From that date, mobile phone companies will cut off the sending of messages coming from aliases – brands, trade names, corporate names, or domains – that do not appear in the official CNMC database.
The obligation extends to any entity that sends notices identified with its name – such as financial entities, insurers, or transport operators – so that operators must also block messages with registered aliases when they come from service providers that are not registered.
Review of requests and technical rejections
From the CNMC, they detail that the procedure requires the express authorization of the holders of the aliases and a subsequent verification by the agency. At the same time, they acknowledge that there is a high number of denied requests due to technical problems or for not having unequivocal confirmation from the applicant.
In this regard, the regulator reminds that the identifier that appears in the header of SMS was until now an element without specific regulation and was used freely, so it insists that, when there is no direct authorization from the holder, the request must be rejected.
Call to SMEs, self-employed, and citizens
The agency has also made a call to citizens, SMEs, self-employed individuals, and small businesses to pay attention to the electronic notifications they are receiving, after confirming that a significant portion of these notices is not opened by the recipients.
The CNMC clarifies that the measure impacts the entire economic fabric, although it specifies that the registration of the alias is not essential to continue operating, as shipments can continue to be made showing the mobile phone number as the sender.
Therefore, it encourages economic agents to act in advance if they wish to maintain the use of their trade names as a visible identifier in messages.
Most exposed sectors to the change
The regulator places banking, the financial sector, passenger transport, messaging and parcel services, healthcare services, and public administrations among the areas most sensitive to this new regulation.
According to the CNMC, continuous monitoring of these strategic sectors is being carried out to ensure that they update their identifiers and can continue to operate with users normally, reiterating the need to respond to requirements or complete pending procedures before the deadline expires.
Origin and timeline of the measure
The registration of aliases was officially established on March 28, after completing the processing of the guidelines that regulate it, according to the report released by Competition.
Later, at the end of April, the Minister for Digital Transformation and Public Function, Óscar López, announced that the database managed by the CNMC would be operational starting June 7.
The definitive date for the entry into force of the mandatory blocking by operators was set for September 15, after adjusting the timeline at the request of the Ministry itself.
Sources from the CNMC rule out that a new extension will occur and remind that any change in deadlines would correspond to the Government to decide.
With this step, the last major measure of the Executive's plan to combat telephone scams and SMS fraud is put into action.