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What is HD after the signal on the mobile phone?
The mobile phone displays HD, which means that the mobile phone has opened the VoLTE high-definition voice call function, and there is no charge for opening the VoLTE function. The call charging standard is the same as the existing ordinary voice, and no traffic fee is charged. Unicom customer SMS subscription/unsubscribe mode: subscription: DGVOLTE to10010; Unsubscribe: TDVOLTE to 100 10.
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