As the backbone of mobile networks, core networks provide users with essential functions, such as mobility and session management, authentication, policy control, and data forwarding. As these networks evolve from 2G to 3G, 4G, and 5G, operators adopt various business models and architectures, increasing the complexity of network O&M. To address this challenge, Huawei has proposed the Single Packet Core solution, which can help operators build a fully cloudified, convergent core network with high reliability. Adopting the cloud-native architecture, the solution enables agile service launch and elastic scaling. It simplifies the network architecture by reducing physical NEs. In addition, the solution provides rock-solid reliability. It also leverages intelligence to provide differentiated network experiences, helping operators to reshape their business models.