Where is the sa switch of Maimang 9?

Click System and Update in the phone settings menu, click Developer Options, click 5G network mode selection, and select SA+NSA mode.

Huawei SA/NSA mode refers to the 5G dual-mode networking mode supported by Huawei devices, and 5G dual-mode refers to the SA/NSA networking mode supported by mobile phones, in which SA is an independent networking, using 5G core network, and the base station is also a 5G base station; NSA is a non-independent networking, using 4G+ core network, and the base station is also a 4G base station.