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How to turn off the HD voice call of OPPO mobile phone?
ColorOS 7 and above: Settings-SIM card and traffic management-Select a SIM card-VoLTE HD calling can be turned off.
Coloros and above: Settings-Dual Card and Mobile Network-Select SIM card-VoLTE call can be turned off.
Remarks:
1, OPPO models use telecom cards to turn on the VoLTE switch by default, and mobile phones cannot turn off this switch.
2.OPPO 5G models use Unicom card to turn on the VoLTE switch by default. If VoLTE needs to be turned off, the 5G switch must be turned off first.
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