SUNRISE domains.“ It required deep coordination across several teams to roll out the fundamental pieces of the technology in the access domain,” Fabrizio recalls.
One of the most critical and often underestimated challenges was ensuring the device ecosystem was ready. A cutting-edge network is only as powerful as the devices that can access it.“ To fully leverage the capabilities of the new network and core, devices needed to be compatible from both a hardware and certification perspective, including regulatory compliance,” Fabrizio explains.“ This meant launching dedicated workstreams with handset manufacturers to ensure smooth integration and engaging closely with regulatory authorities, so that customers could use the new technology safely and seamlessly.” Alongside its forward-looking 5G strategy, Sunrise made another bold and decisive move: the shutdown of its 3G network.
“ The biggest challenge was customer migration, especially since we had already switched off 2.5G in Switzerland years before. That left no fallback,” Fabrizio explains.
To manage the high-stakes transition without leaving any customers behind, Sunrise adopted an intensely data-driven governance model.“ We analysed large
108 October 2025