What happened to the small box of hd in the upper right corner of Huawei Glory 8 mobile phone?

Hello, the high-definition icon is displayed in the status bar of the mobile phone screen, indicating that the mobile phone has turned on the VoLTE high-definition voice function. If not, users can turn on the dual-card settings of the mobile phone, find the high-definition voice switch, and then turn off the high-definition voice function. When this function is turned off, the HD icon on the status bar of the mobile phone will disappear.

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