Is this sales call legal?
Since 17 October 2026, companies in Spain may only make sales calls from nine-digit numbers that start with 400. Type the number that called you to see whether a sales call from it follows the rule.
This rule is Spain’s. The tool checks Spanish numbers (+34); in other countries different rules apply.
What you can do
- Say no and ask the company to delete your number from its list of contacts.
- Sign up to the Lista Robinson to opt out of advertising calls.
- Ask your operator to block calls from the 400 range, or block them with an app such as NoCall.
- Complain to the Telecommunications User Office (OAUT) about a sales call that did not come from a 400 number.
Sources
- Resolución de 14 de abril de 2026, de la Secretaría de Estado de Telecomunicaciones e Infraestructuras Digitales (BOE núm. 93, de 16 de abril de 2026, BOE-A-2026-8409) · Boletín Oficial del Estado
- Las llamadas comerciales deberán usar el prefijo 400 (nota de prensa, 16 de abril de 2026) · Ministerio para la Transformación Digital y de la Función Pública
- Oficina de Atención al Usuario de Telecomunicaciones (OAUT) · Secretaría de Estado de Telecomunicaciones e Infraestructuras Digitales
- Lista Robinson: servicio de exclusión publicitaria · Lista Robinson
Which countries it covers
This tool only applies Spain’s rule (BOE-A-2026-8409, in force since 17 October 2026). Spanish numbers can be checked from any edition.
Indicative information from published numbering plans. It describes the type of number, never the person or company behind it.
Frequently asked questions
Since when must sales calls use 400?
Since 17 October 2026. The resolution was published in Spain’s Official State Gazette on 16 April 2026 and gave six months for the range to be ready.
Is a call from a 400 number a scam?
Not necessarily. It means the call is commercial, which is legal, but it does not make the offer a good one. You can always say no.
Will my bank or electricity company call me from a 400 number?
It shouldn’t for an incident or after-sales service: 400 may not be used for customer service. Those calls come from short, 800/900 or landline numbers.