In this first publication of NGMN’s Green Future Networks Phase 2 in 2023, the key challenges mobile operators face in developing sustainable supply chains are outlined. A review of the emerging regulatory and standards environment is conducted. Approaches and best practices in developing sustainable supply chains are identified by relating the emerging business and regulatory environment to examples of the changes that operators and their supply chain partners may need to make, both at strategic and operational levels. Integrating sustainability goals into the operator’s core objectives is of key importance as well as selecting suppliers whose own sustainability strategies are aligned with these goals. Finally, a checklist based on the best practices in the industry is provided to support operators in developing a sustainable procurement strategy. Examples from across the industry are included that highlight that companies are already embracing many of the concepts identified in this publication.