Samsung Galaxy S10+ (SM-G975F - Exynos) VoLTE & WiFi Calling - Samsung Galaxy S10+ Questions & Answers

Looking for some help enabling VoLTE on my S10+.
I currently have a SM-G975F on AT&T in the United States. Everything is working as expected except for VoLTE (and WiFi calling but that's not as important). I had both of these working on my old S9 (SM-G960F).
The CSC that came with my phone was "TPA" (Panama region - generic like BTU) so I flashed to the EE (EVR) firmware from sammobile hoping that being on a carrier rom would enable the feature(s). Followed the guide to enable VoLTE https://www.androidcentral.com/how-enable-volte-galaxy-s10 after flashing the new region, but it never appeared.
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[Q] Is there any problem with ota if it shows two active csc together?

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Why it shows that active csc : xsp/btu
My current/active CSC is BTU .
Can you explain please.
So far i know that my phone came with France (XEF) firmwire.
Then i flashed Xsp and after then Sintel based firmwire.
I had a problem that i could not access on call divert options.
Then I flashed BTU firmwire which was downloaded from sammobile.Then that problem was solved.
Everything seems fine.But recently i checked Sammobile and i saw another update came on that changes the csc 'G1' to 'J3'
But i can't find that update via OTA! Is there any problem or its Normal . I'd be thankful to you if you help me with this
[/QUOTE][/IMG]

Unable to run USSD codes?

Hi, recently I flashed/updated via Odin (all the files including CSC, not the Home_CSCS) my phone (S7 edge G935f) with the latest Germany Vodafone firmware (QD2), previously my phone was DBT. Now I encountered the following "problems". I am not able to run any USSD codes and my imei registration status says "Not registered". The device doesn't seem to behave weird, I have carrier signal and full LTE speed.
Will I be able to receive OTA updates in the future?
Did I do anything wrong?
Any information is welcomed.
*I don't know how to add pictures to the thread so I'm trying*
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4G LTE/LTE+ in Europe with US version

Hey,
I bought galaxy s8 US unlocked version while traveling in USA it was flawless there, now I'm back in Europe. Everything works just fine except mobile internet. I can't get 4G LTE+ and having only LTE, which is slow comparing to LTE+. So I checked if there could be a problem with frequencies in willmyphonework.net.
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It says that there shouldn't be any problems, so now I'm confused, maybe this is software problem, I mean maybe I need my region firmware in order to use 4G LTE+ internet, any ideas or suggestions?
Thanks

VoLTE on s7 edge G935U

Hy all! I have s7 edge verizon but install u firmware and now "it's" g935u . So , I root him, i changed the csc files (original XAA csc) so that the result is csc it's from/active XEU ..
So all good now volte it's active all functions it's active but no volte icon on bar status ...
I really like that icon up in the status bar... is there any way I can solve this?
Thank you in advance!
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https://image.ibb.co/mEpvsb/Screenshot_20171031_235115.png
I apologize for this big pictures but xda not leave me to attach here.....

How to switch carrier configuration?

I have a problem. I use stock XEO ROM (unbranded firmware for Poland) and all my carrier features like WiFi Calling or VoLTE were working correctly (Service Provider SW version in About Phone said back then that CSC is XEO/XEO/OMN - my phone is from Italy, that's why the last bit is different).
I visited Russia recently and got a local SIM there. After using it my configuration changed and now back home carrier features stopped working, CSC in About Phone changed to XEO/SER/OMN.
Is there any way to trigger the configuration change again so it goes back to previous state without having to reflash everything? I don't have root.
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