At O2 Telefónica Germany, the “network of the future” is no longer a distant vision, it’s becoming an operational reality. Under the leadership of Matthias Sauder, Director Networks, the operator has made substantial strides in transforming its end-to-end infrastructure to meet the demands of a highly agile, programmable, and customer-focused future.
At the FutureNet World conference in London (7–8 May 2025), where leading telco and tech stakeholders gathered to explore network automation and AI in telecoms, Sauder shared how O2 Telefónica’s evolution journey spans radio, transport, core, data centres, and cloud landing zones, all underpinned by a strategy that prioritises automation, flexibility, and openness.
The transformation began with a foundational goal: enhancing radio network quality. Once considered the underdog in a three-operator market, O2 Germany set out to radically improve performance by embracing agile practices and reshaping internal structures. Inspired by the Spotify model, the company introduced agility not just in project management but also in technical delivery. This included frequent software release cycles for radio, positioning itself as a global leader in rapid deployment and continuous integration.
A key initiative known as Tech Strategy 25 laid the foundation for modernising radio, transport, and core networks. Today, over 80 percent of the strategy has already been executed. With a largely cloud-native core in place, O2 Telefónica is among the pioneers of this architectural shift. Its collaboration with Ericsson produced one of the world’s first cloud-native digital cores, while a parallel effort with Nokia deployed core services for one million users in a public cloud environment.
The rationale behind both cloud-native and public cloud approaches is clear. Legacy architectures no longer support the operational agility or cost efficiency needed in today’s competitive telecom landscape. Cloud-native systems enable advanced capabilities such as continuous integration, continuous delivery, and seamless in-service software upgrades (ISSU). O2 Telefónica has shown these upgrades can be executed without disrupting live customer services, challenging the long-standing perception that such practices are too risky for telco-grade reliability.
Beyond infrastructure, the company’s future network model hinges on the integration of open APIs and Network-as-a-Service (NaaS) capabilities. These aren’t abstract concepts, they’re practical tools enabling agility, programmability, and new revenue streams. Open APIs expose network functions to external developers and partners, unlocking opportunities for co-creation and monetisation that were previously out of reach.
This openness also extends to industry partnerships. A standout example is the company’s collaboration with Siemens, which now leverages O2's slicing capabilities to deliver tailored network services to its own customers. These kinds of arrangements demonstrate how NaaS, built on secure and standardised APIs, can unlock vertical-specific innovation.
But transformation isn’t just about technology, it’s also about mindset and culture. Simplifying and standardising network configurations (for example, reducing radio setups from over a hundred to just two) and promoting a service-centric approach are part of a broader shift. The focus is firmly on use cases and customer value, avoiding the trap of deploying technology for its own sake. Every new system or tool must demonstrate end-to-end value.
O2 Telefónica also recognises that data, rather than AI alone, is the foundation of intelligent automation. Without a robust data strategy, ambitions around AI, closed-loop automation, or service orchestration are unlikely to succeed. The company’s investment in OSS transformation and data-driven operations is laying the groundwork for intelligent networks that can scale, adapt, and optimise in real time.
As the line between network and IT continues to blur, O2 Telefónica is aligning its BSS, OSS, and IT systems with its network strategy. This integrated approach supports holistic innovation and positions the company to deliver services with faster time to market and greater cost efficiency.
The transformation journey shared by Matthias Sauder is more than a technical roadmap, it’s a call for industry-wide disruption. With revenues flat and operational costs rising, embracing NaaS, open APIs, and cloud-native infrastructure is no longer optional. It’s the only viable path for telcos to stay competitive, innovative, and relevant in a software-defined, platform-centric future.
Sauder’s full presentation at FutureNet World provides deeper insight into this journey. You can watch it below:
