New mandatory SMS alias registration in Spain: what's changing and how it affects you

What is a Sender ID (alias) in SMS?

A sender ID (alias) is the name that appears as the message sender instead of a phone number. For example, a company can send SMS messages displaying “LABSMOBILE”, “BANK”, or its brand name.

This improves brand recognition, but it has also been used fraudulently. Therefore, the new regulation requires that every sender ID be officially registered and linked to a legitimate company.

Why has this registry been introduced?

The main objective is to increase the security of the SMS channel and prevent fraud. Until now, companies could freely configure sender IDs, which allowed impersonation.

Under the new regulation:

• All sender IDs must be registered with the CNMC
• The company must prove ownership or legitimate use
• The sending provider (such as LabsMobile) must be authorized

This ensures that only legitimate businesses can use specific sender IDs.

Key date: June 7, 2026

This is when the regulation becomes fully enforceable. From that date:

• SMS with unregistered sender IDs will be blocked
• Messages from unauthorized providers will be rejected
• Non-compliant messages will not be delivered

This means that failing to register your sender IDs on time may result in a complete service disruption.

Who is affected by this regulation?

This regulation applies to any company sending SMS to Spain, regardless of where it is based:

• Spanish companies
• International companies
• SaaS platforms
• Marketing agencies
• Public and private entities

If you send SMS to Spanish numbers using sender IDs, you must register them.

Requirements to register a sender ID

To complete the registration, companies must demonstrate a legitimate link between the sender ID and the business. This may include:

• Registered trademark
• Trade name or legal entity name
• Corporate domain

Additionally:

• The owner must validate the registration with the CNMC
• The authorized provider (LabsMobile) must be specified
• The process may take several days or weeks

LabsMobile: registered operator and full-service support

In this new environment, choosing the right provider is essential.

LabsMobile is a registered telecom operator in Spain and has direct access to the sender ID registration process. This allows us to:

• Manage the registration on behalf of our clients
• Act as an authorized provider before the CNMC
• Simplify the entire process
• Prevent disruptions in message delivery

Additionally, we have already started registering sender IDs for our existing clients.

What should LabsMobile clients do?

If you are a new or existing client and want to send SMS to Spain, you must complete the following form:

https://forms.labsmobile.com/solicitud-registro-alias-es

With this information, our team will:

• Review your documentation
• Prepare the submission
• Initiate the registration with the CNMC
• Assist you during the validation process

Without completing this process, message delivery in Spain cannot be guaranteed.

Key recommendations

• Identify all sender IDs you currently use
• Ensure you can prove ownership or usage rights
• Start the registration process as soon as possible
• Centralize the process with LabsMobile

Acting early is critical to avoid operational issues.

Benefits of the new regulation

Although it introduces changes, it also brings important benefits:

• Greater user trust
• Reduced fraud and spoofing
• Stronger brand protection
• Improved SMS channel quality

Conclusion

The mandatory sender ID registration marks a turning point in business messaging in Spain.

From June 2026:

• Only registered sender IDs will be allowed
• Operators will block non-compliant messages
• Companies must adapt to continue sending SMS

LabsMobile is ready to support you through this transition, ensuring a fast and seamless adaptation without impacting your business.

Complete the form now and secure your SMS delivery in Spain:

https://forms.labsmobile.com/solicitud-registro-alias-es