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Then you might have to go the way with the Qualcomm PDC tool. Or, try the following: Mein Gerät > Alle Spezifikationen > 5 x click on "Kernel" CIT Tool opens. Click on the 3 dots in the right top corner and select "weitere Tools". Then "MODEM Testtools" and there (should be the last in the...

No, just a working phone. ;) In my office, reception is nearly zero. So without VoWiFi, I cannot make phone calls and my clients cannot call me! So all the other features get irrelevant if I can't make PHONE CALLS with a PHONE!

I ended up with the solution buying a Galaxy Note 10 today.

As I wrote in the first post: I tried that too. Btw. this can be done much easier directly on the device with the app "Activity Manager 3.0.0" (not on Google Play, search for the apk) Install the app, search for "modem config", open it and select your desired modem configuration file.

I just invested a few hours more and flashed the official Xiaomi EEA ROM in hope for better EU provider specific support by Xiaomi itself. But no luck. :( Still doesn't work with T-Mobile Austria. I'll pick up a Galaxy Note 10 tomorrow!

I totally agree with what you said. There's a good chance, a specific certificate or similiar is needed. As you said, VoWiFi is not that easy as there must be a "trusted connection" to the mobile provider as the SIM card is no longer connected to the network, so it must be confirmed that only...

After several hours of testing, I came to the conclusion that there must be some configuration data be missing for VoWiFi on T-Mobile Austria. mi 9T Pro MIUI 11.0.5 (xiaomi.eu) VoLTE works(! even though no icon is displayed) VoWiFi does not work with my T-Mobile AT SIM-card, but works with an...

I had the same problem. Got my T9 Pro last week, unlocked the bootloader, flashed TWRP (3.3.1-13) and xiaomi.eu MIUI 11.1 9.10.24 from last week. Everyrhing worked fine. Today I got an update notification for MIUI 11.1 9.10.31 Downloaded it, and clicked [install] TWRP flashed the new image and...