The document discusses the role of telecommunication companies (telcos) in the digital advertising value chain. It notes that while advertising-funded services are seen as a future revenue source, they are unlikely to be very attractive for telcos and risk cannibalizing subscription revenues. The big opportunity for telcos is to develop a large-scale advertising enablement platform leveraging their large customer base and customer data. However, telcos currently remain fragmented in pursuing this opportunity. To successfully develop a platform, telcos need to work together on open standards and provide an end-to-end solution through partnerships across the advertising value chain.