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Rooted or not:
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APP Name & APP Version (If your issue relates to the app):
In addition to information above, please also provide as much details as you can, e.g., using scenario, what troubleshooting you've already done, screenshot, etc.
My same problem with my ROG Phone 3
I live in Hong Kong and can use wifi calling with Android 11, but can not use any more after upgrading to Android 12.