- These numbers will be one-way, as customers will only be able to receive calls, and will allow users to easily identify them, reinforcing their security against phone scams.
- The measure complies with the Customer Care Services Act (SAC), approved last December, and complements the Anti-Phone Scam Plan that has allowed more than 192 million calls and 17 million SMS to be blocked with fraudulent intentions since its launch in March 2025.
- As for the customer service calls, they can only be made from the short numbers specifically attributed for it, the free ranges (800 and 900) or the geographical numbers.
The Ministry for Digital Transformation and the Civil Service has today published a resolution stating that, since next October, commercial calls must be made from a nine-digit numbering beginning with code 400, which will allow users to identify those calls with ease.
That new numbering will be operational in six months and, from that moment in October, operators will block calls that are not made from the assigned numbering.
This complies with the Customer Care Services Act (SAC), approved last December, which included the need for commercial calls to have a specific numerical code.
The numbers starting with code 400 will be unidirectional, i.e., users will only be able to receive calls. In this way, the protection of the clientele is further guaranteed, as possible fraudulent practices that could occur when returning a call to a number that is not known are avoided.
“We’ve all ever had calls from a mobile phone that we picked up thinking it was a family member or a friend and then it was a business call. From October, we will all be able to identify if it is commercial”, explained the Minister for Digital Transformation and Public Service, Óscar López, before participating in the AMETIC AI Summit 2026.
From there, the minister thanked “the collaboration, effort and work of the telephone companies that are accompanying the Government and the Ministry” both in this measure and in the implementation of the Anti-Telephone Scam Plan. A plan with which, López recalled, “we have managed to block 192 million calls and 17 million SMS” since its approval in March last year.
The resolution also recalls that telecom operators can offer their customers the possibility of disconnecting from the commercial call service provided through the 400 range.
In case of receiving commercial calls from numbering that is not attributed to that service, users can report it to the Telecommunications User Service Office (OAUT) and/or the CNMC.
Customer service calls
Likewise, in another resolution published today, the Ministry for Digital Transformation and Public Service establishes that customer service calls are only made from the short numbers specifically attributed for it, the free ranges 800 and 900 or geographical numbers.
The Ministerial Order against Phishing Scams by Phone Calls or SMS Mailing, which came into effect in March last year, already attributed the 800 and 900 ranks for those calls, and also banned the use of mobile numbering. Now, through this resolution, the permitted numbering ranges are expressly specified.
Since the launch of the Telephone and SMS Anti-Scam Plan in March 2025, telecommunications operators have blocked 192 million calls and 17 million SMS with fraudulent intentions.
In addition, the latest measure of the Government’s Telephone and SMS Anti-Fraud Plan will soon be completed: an official database with alphanumeric codes used by companies and public administrations as identifiers in SMS and managed by CNMC. As of June 7, telephony operators will block messages coming from unregistered aliases.