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Spain implements 400 prefix for commercial calls

Updated 5 times since CLSTR started tracking revisions of this situation.

What changed

2026-10-18 04:37 UTC → 2026-10-23 07:35 UTC · added removed

Spain has officially implemented the a new telecommunications regulation requiring all commercial sales calls to use a specific nine-digit prefix starting with 400. Effective as of October 17, 2026, this measure aims measure—proposed by the Ministry for Digital Transformation and the Civil Service—aims to help consumers identify marketing calls before answering and to combat telephone fraud. The new numbering system is unidirectional, meaning users can receive calls but cannot call back these specific numbers. This design is intended to prevent users from inadvertently returning calls to fraudulent sources. While large companies and essential service providers—such as electricity, gas, and telecommunications—are strictly bound by these rules, small businesses and freelancers must also adapt their sales outreach to comply. Major operators have begun assigning number blocks. Movistar will utilize 400 00 1004, while DIGI will use several specific ranges and provide a ‘Commercial Call’ label on mobile screens. Telecommunications operators are also required to allow customers to block entire series of 400 numbers upon request. Consumer organizations, Implementation has sparked debate regarding specific sectors, such as CONSUBAL, have welcomed insurance brokerage. Experts suggest that while brokers performing cold calls using purchased databases must adopt the increased transparency but continue to call 400 prefix, those managing existing client portfolios for increased oversight and stricter sanctions cross-selling may not be subject to ensure the measure effectively reduces unwanted spam rather than just changing same requirements. Additionally, the caller ID. National Commission on Markets and Competition (CNMC) is modifying rules for nomadic VoIP services, transitioning them from certain provincial ‘8’ numbers to a specific ‘51’ numbering block to prevent number exhaustion.

Versions

  1. 2026-10-23 07:35 UTC Spain implements 400 prefix for commercial calls
  2. 2026-10-18 04:37 UTC Spain implements 400 prefix for commercial calls
  3. 2026-10-17 22:46 UTC Spain implements 400 prefix for commercial calls
  4. 2026-10-16 15:09 UTC Spain telemarketing regulation and spam prevention
  5. 2026-10-16 04:29 UTC Spain telemarketing regulation and spam prevention
  6. 2026-10-15 00:13 UTC Spain telemarketing regulation and spam prevention

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