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How to turn off HD calls?
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At present, operators have shut down 2G/3G networks in some areas, and voice calls under 4G/5G networks need VoLTE bearer. The phone turns on the "VoLTE HD Call" function by default. If VoLTE is turned off, you will not be able to make voice calls when you go to areas that do not cover 2G/3G networks. If you use a 5G mobile phone, you will not be able to register the 5G SA network, which will affect the daily use of the big hole. Therefore, it is recommended not to turn off VoLTE.
note:
1. After the telecom card turns off VoLTE, it is impossible to register the 5G NSA network; Mobile Unicom card can register to NSA network after turning off VoLTE; Unable to register 5G SA network after turning off VoLTE;
2. After closing the VoLTE service, the system will prompt you to open VoLTE once a day in the dialing interface;
3. You can contact the operator's customer service to cancel the VoLTE service.
You still need to close the clickable link to find the online customer service help page link.
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