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Huawei mate30 opens vonr
Mate 30 is set in developer mode, one is to start VoNR HD call, and the other is to select SA+NSA mode in 5G network mode.
Open the developer options mode:
Method 1:
1. Open the settings, enter the version number in the search box, and click the version number to enter the page about the mobile phone;
2. Click the version number 7 times continuously and quickly until a prompt appears, prompting you to be in development mode!
3. Open Settings > System and Updates > Developer Options.
Method 2 (HarmonyOS system):
Open the settings, pull to the end, enter "about mobile phone" and find the version number.
The remaining steps are the same as the method 1.
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