Why you now have to prove an address for fixed numbering

This article is informational and does not constitute legal advice. For your specific case, consult your advisor.

The fight against phone scams has brought a change that affects how fixed numbering is contracted and used in Spain: you now have to prove a genuine link to the territory in order to hold geographic numbering.

Order TDF/149/2025

Order TDF/149/2025, of 12 February (BOE-A-2025-2870) sets out measures to combat identity-spoofing scams via fraudulent calls and messages, and to guarantee the identification of the numbering used for customer service and unsolicited commercial calls.

What it means for fixed numbering

Geographic numbering is tied to a province, and the rule reinforces that link: to hold national fixed numbering you need a genuine presence in Spain and, specifically, in the province corresponding to the prefix. In practice, this means proving an address or establishment in that area (for example, with documentation showing an address in the province).

A direct consequence is that companies without a registered office or representation in Spain cannot present themselves with Spanish fixed numbering, closing off a common avenue for fraud.

Blocking calls with a false caller ID

The rule also requires operators to block calls that:

• present an empty caller ID (CLI) or one whose format is inconsistent with the National Numbering Plan,
• use a Spanish identifier not attributed to any service, or
• present as CLI numbering not assigned to the party making the call.

The goal is that the number appearing on your screen really belongs to the caller, making spoofing (caller-ID impersonation) much harder.

What you should keep in mind

• If you need geographic numbering for a province, be ready to prove your link to that area.
• Work with an operator that complies with the identification and blocking requirements; it protects both you and your customers.
• Check that the numbering you call from is correctly attributed to your company.

At Virtual Voz we assign geographic numbering in compliance with current regulations and take care of the required documentation. If you have questions about your numbering, get in touch.