How do I enable 5G on the Magic V2?
First confirm your SIM card supports 5G based on your carrier's network information, then contact your network operator to enable 5G. If two SIM cards are inserted, go to Settings > Mobile network > SIM card management and set SIM 1 or SIM 2 as the default data card. Note that 5G may not be available in all countries, regions, or network environments.
From the official Honor Magic V2 Foldable Smartphone manual, page 7
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