Rakuten Mobile operates a fully cloud-native mobile network. It launched 4G service in Japan in April 2020, and launched 5G non-standalone (NSA) services in September 2020 in record time. With four million subscribers today, Rakuten mobile continues to advance and scale its network to support new demands driven by the growth of remote and mobile workers. With the implementation of Segment Routing over IPv6 (SRv6) and Cisco Routed Optical Networking, the network will expand its capabilities to support enterprise customers.
Source: https://www.helpnetsecurity.com/2021/06/29/cisco-rakuten-mobile/