{"id":17051,"date":"2026-06-12T15:58:51","date_gmt":"2026-06-12T13:58:51","guid":{"rendered":"https:\/\/glofera.com\/?p=17051"},"modified":"2026-06-12T17:00:48","modified_gmt":"2026-06-12T15:00:48","slug":"lucas-mariconda-and-glofera-at-racing-weekend-2026-2","status":"publish","type":"post","link":"https:\/\/glofera.com\/en\/lucas-mariconda-and-glofera-at-racing-weekend-2026-2\/","title":{"rendered":"400 Sales Calls: What the New Mandatory Prefix Means and How to Comply Without Complicating Things"},"content":{"rendered":"

If your company calls customers or potential customers to sell, renew, or promote something, this is important to you. Very important. The new regulation requires that these types of calls be made from numbers starting with 400<\/strong>. This is not a recommendation: sales calls that do not use this numbering may be blocked directly by the carriers. <\/p>\n

Don’t worry. We’ll explain what the regulation says, why it exists, and\u2014most importantly\u2014how to comply with it without turning your business upside down. <\/p>\n<\/div>

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We\u2019ll analyze your company\u2019s communications for FREE<\/strong> <\/span><\/p><\/h4><\/div>

REQUEST A CONSULTATION<\/span><\/a><\/div><\/div><\/div><\/div>\n\n<\/div><\/div>
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What does the 400 prefix mean for business calls?<\/strong><\/h2>\n

Short answer: All sales calls must be identified by a number starting with 400. This number range is reserved exclusively for telemarketing, so that anyone knows, before picking up the phone, that they are being called to make a sales pitch. <\/p>\n

The measure is part of the anti-fraud plan launched by the Ministry for Digital Transformation<\/a>. Why? Because telephone scams have skyrocketed. Cybercriminals impersonate banks, electric companies, or even government agencies to deceive users. The government already took action in 2025 by blocking calls and SMS messages from unassigned numbers and banning sales calls from mobile numbers. 400 sales calls are the next logical step: if every sales call must start with 400, any \u201coffer\u201d coming from another number is, at the very least, suspicious. <\/p>\n

At the same time, the CNMC has implemented mandatory registration of SMS aliases<\/strong>: companies that send text messages with alphanumeric sender IDs (such as “YourBank” or “YourStore” instead of a phone number) must register those aliases. If it is not registered, the message is blocked. Same spirit, different channel. <\/p>\n

When is the 400 prefix used? <\/strong><\/h2>\n

According to the government\u2019s announcement, the requirement takes effect in October 2026<\/strong>. That means your company has the coming months to request the new numbering, configure its phone systems, and train its team. It seems like plenty of time; it\u2019s not so much if you manage multiple numbers, work with an external call center, or your sales team makes calls from their cell phones. <\/p>\n

Our advice: don’t wait until the last minute. Changes to phone numbers and PBX settings are easy if you plan ahead, but they can turn into a nightmare if you try to handle them at the last minute. <\/p>\n

What area code should business calls have?<\/strong><\/h2>\n

It depends on the type of call, and here\u2019s the nuance that many small and medium-sized businesses overlook:<\/p>\n