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No Wi-Fi Calling setting

Star III
Please tell us some basic information before asking for help:
Model Name: ASUS ZenFone 9 256 GB/16GB
Firmware Version:32.2040.2040.28
Rooted or not: No
Frequency of Occurrence: Continual
APP Name & APP Version (If your issue relates to the app): The phone, settings
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.
I'm using Mint Mobile (T-Mobile MVNO), and Wi-fi calling doesn't work. The option doesn't even present itself in the menu. I find it very hard to believe that a product that markets itself as fully compatible with T-Mobile and its MVNO's doesn't support this basic feature. I was wondering if anyone has found a way to make this work, or is this just an early adoption bug?


Star III
Try entering the following in the phone app: #*#3642623344#*#

Star III
T-Mobile "calling over wifi" works in my country, so it should only be a setting change for Asus.

The other provider it does not in my country is KPN.
Entering the code #*#3642623344#*# does bring up "calling over wifi" for the KPN, but it doesn't work

Hall of Fame I
I literally cannot believe you have a mobile provider that is literally owned by the actor that plays deadpool.

Star II
bonjour . paramètres......appels , en bas activer appels wi fi non ?