Spain: SMS Guidelines
MCC: 214
Dial Code: 34
Spain's telecoms regulator, the CNMC, is rolling out a new Alias Registry as part of Circular 1/2026. Starting September 15, 2026, any alphanumeric Sender ID — that's the brand name people see instead of a phone number when they receive an SMS — must be registered before it can be used to send messages to Spanish numbers (+34).
The quickest and simplest option for now is long-code overwrite: replacing the branded Sender ID with a randomised numeric long code. No registration paperwork or action is required from you or your customers for this option. This is the interim approach we are pursuing for unregistered Sender IDs, including while registration and the required authorization are pending.
Information on Alphanumeric Sender ID registration:
Please provide the details below to alpha_sender_id@telnyx.com:
Your company details
— Full legal company name
— Your NIF/CIF (Spanish tax ID for companies) or EU-VAT number if you're based outside Spain
— Registered company address
Legal representative
— Full name
— NIF or passport number
— Mobile number and email address
Sender ID details (one set per alias)
— The exact alias as it appears in your messages (e.g. MYBRAND)
— What you use it for (transactional, OTP, marketing, etc.)
— Planned start and end date — note that registrations are valid for a maximum of 24 months
Proof of ownership — one of the following per alias:
— Trademark or trade name → certificate from OEPM (Spain) or EUIPO (EU)
— Company name → certificate from the Spanish Mercantile Registry
— Domain name → proof of ownership of a .es or ICANN-registered domain that matches the alias
Please make sure to always refer to our Acceptable Use Policy for Messaging.