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Commercial calls will use 9-digit numbers with 400 prefixes

In addition, calls to customer service may be made only from short numbers, free intervals (800 and 900) or geographical numbers specifically assigned for this purpose.

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The new number range of commercial calls will have nine digits and start with 400 prefixes. Photo: Now

The new number range of commercialcalls  will have nine digits and will begin with the prefix 400, according to one of the two resolutions issued this Wednesday by the State Secretariat for Telecommunications and Digital Infrastructure.

The second published resolution provides that calls for customer service may only be made from the short numbers, free intervals (800 and 900) or geographical numbers specifically assigned for this purpose.

When the new count is fully operational, operators will block calls that they consider commercial and customer service and are not using the established numbering.



The text submitted for public hearing sets aperiod of four months from the entry into force of the resolutions.

If, after entry into force, a user receives a commercial or customer service call from an unauthorized number, he or she may file a complaint with the Telecommunications User Care Office (OAUT) or the National Commission on Markets and Competition (CNMC). 

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