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With 5-20 MHz of supporting 4G spectrum, LG U+ subscribers achieved average 5G download speeds of 201.6 Mbps, as seen by our users. By global standards, all three Korean operators have deployed a large amount of new 5G spectrum - in many markets operators have launched with just 40MHz or 50MHz of new mid-band spectrum. In the biggest South Korean cities, our users on LG U+’s network also saw fast 5G download speeds, comparable with SK telecom and faster than in the case of KT. Interestingly, additional 4G spectrum bandwidth capacity helped to offset the initial difference in average 5G download speeds that we saw between a smaller block of 80 MHz spectrum in the 3.5 GHz band used by LG U+ and larger blocks of 100 MHz in the same band used by KT and SK telecom. NSA 5G is the most common way that operators have launched 5G worldwide. This simultaneous use of the 4G and 5G spectrum is a characteristic of 5G non-standalone access (NSA) where both technologies must work together. We examined users’ 5G download speeds when they were connected to either 80MHz or 100Mhz of 5G spectrum and compared the resulting experience when different quantities of 4G spectrum were also connected. Even with South Korea’s operators using relatively large amounts of new mid-band 5G spectrum, our users saw significantly higher average 5G download speeds when additional 4G spectrum was used. To explore this topic further, Opensignal looked at South Korea’s mobile market, known for its advanced 5G deployments. In our previous insight, we observed that our users in Germany, Italy and the UK experienced significantly faster 5G average download speeds when they were also connected to additional amounts of 4G spectrum, through older 4G technology.