We adopt the market best practices
Our performance is continuously monitored and assessed through performance indicators and an audit programme. We invest in the certification of processes in order to guarantee the highest quality the products and services we provide and the satisfaction of all the stakeholders.


NOS SGPS, S.A. is certified for quality and environment in compliance with the standards ISO 9001:2015 and ISO 14001:2015 for NOS Comunicações S.A., NOS Inovação S.A., NOS Sistemas S.A., NOS Technology S.A., NOS Corporate Center S.A. and NOS Wholesale S.A., and with regard to Information Security in compliance with the ISO/ IEC 27001:2013 standard for NOS Comunicações S.A.(1), NOS Corporate Center S.A., NOS Wholesale S.A. and NOS Sistemas S.A. (2). Additionally, NOS Comunicações S.A. is certified for compliance with the standards ISO 45001:2018 (3) and ISO/IEC 20000-1:2018 (4).

Check the certificates below:

Safety and Health at Work
Information Security
Service Management

(1) The Information security management system applies to: The business processes related to installation, activation, fulfilment of service requests, account management, billing and charging for telco customers in the market segments: consumer, business, corporate and wholesale.
(2) The Information security management system applies to the security processes associated with the data center services.
(3) The scope of this certification is the Development, Marketing and Management of the Customer Service of Corporate Products and Services.
(4) The scope of this certification is the Telecommunications and ICT services provided to corporate customers, according to the service catalog and from Lisbon and Oporto operational centers.