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: our customers, our shareholders, investors, suppliers, partners, government and regulatory entities, the industry, third sector organisations and society as a whole.



NOS SGPS, S.A. is certified for quality and environment in compliance with the standards ISO 9001:2008 and ISO 14001:2012 for NOS Comunicações S.A., NOS Inovação S.A., NOS Sistemas S.A., NOS Technology S.A. and NOS Towering S.A., and with regard to Information Security in compliance with the ISO/ IEC 27001:2013 standard for NOS Comunicações S.A.1 and NOS Sistemas S.A. 2. Additionally, NOS Comunicações S.A. is certified for compliance with the standards OHSAS 18001:2007 3 and ISO/IEC 20000-1:2011 4.


Check the certificates:
QualityEnvironment Safety and Health at Work Information Security Service Management



1 The scope of this certification is the business processes "Customer Management" and "Billing and Charging" for fixed and mobile service clients of NOS, in the market segments: Residential, Personal, Business (with primary focus on Corporate clients) and Wholesale.
2 The scope of this certification is the security processes associated with the “Housing” services provided at NOS Data Centers in Lisbon and Oporto.
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.