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My mobile phone is Huawei P40pro. How can I turn on Volte?

Preparation tool: Huawei P40

Step 1: Click to open the phone settings.

Step 2: Set the interface, click System and update.

Step 3: Click to select the "Developer" option.

Step 4: drop down the developer options interface and find VoNR HD call.

Step 5: Click the button behind VoNR HD call to open successfully.