ISO (International Organization for Standardization) has several standards that are relevant and widely used in the telecommunications industry. Some of the key ISO standards in telecommunications are:

ISO 9001: This is the most widely recognized standard for quality management systems. It provides a framework for organizations to implement and improve their quality management systems. ISO 9001 certification is widely used in the telecommunications industry to improve quality, customer satisfaction, and efficiency.

ISO/IEC 27001: This is a standard for information security management systems (ISMS). It provides a framework for managing and protecting sensitive information, including customer data, intellectual property, and network infrastructure. ISO/IEC 27001 certification is important for telecommunications companies that handle sensitive information and want to demonstrate their commitment to information security.

ISO/IEC 20000: This is a standard for IT service management. It provides a framework for managing and improving IT services, including network infrastructure, software development, and customer support. ISO/IEC 20000 certification can help telecommunications companies to improve service quality, reduce downtime, and increase customer satisfaction.

ISO 14001: This is an environmental management system standard. It provides a framework for managing and reducing the environmental impact of a company's operations, including energy use, waste management, and carbon emissions. ISO 14001 certification can help telecommunications companies to reduce their environmental footprint and demonstrate their commitment to sustainability.

ISO 27018: This is a standard for the protection of personally identifiable information (PII) in public clouds. It provides a framework for protecting PII when it is stored, processed, or transmitted in the cloud. ISO 27018 certification can help telecommunications companies to ensure the privacy and security of their customers' data.

ISO 22301: This is a standard for business continuity management. It provides a framework for managing and minimizing the impact of disruptions to business operations, including natural disasters, cyber-attacks, and other incidents. ISO 22301 certification can help telecommunications companies to ensure the continuity of their operations and maintain the trust of their customers.

Overall, these ISO standards can help telecommunications companies to improve quality, information security, service management, environmental performance, privacy, and business continuity. By adhering to these standards, telecommunications companies can enhance their reputation, reduce risk, and increase customer satisfaction.