How to switch carrier configuration? - Samsung Galaxy S8 Questions and Answers

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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[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
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just wondering...

If you install a custom rom & rooting your device can it stop you from sending and receiving SMS? because ever since i have rooted my device there is a delay on receiving any sms, calls and network work fine but SMS seems weird and it wasn't like that before rooting and installing a custom rom :\
I installed the correct CSC for my region (VAU) Australia Vodafone
could it be the a incorrect CSC?
I can give you screen shots of "Phone Info" ?
0verdaflow said:
check the gsm settings .. and that the phone recognises that in ur the right country and region .... and those sort of things .
whats delay is there ???
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Click to expand...
Click to collapse
just realised that the CSC is branded that i have installed. Could this be the reason why ?

Can't install any rom other than the current csc

I wan't to get rid of the current branded rom (csc = pls), but odin doesn't let me to install any stock rom other than pls ("fail" message after flashing).
The phone doesn't have a simlock, just a "csc lock" as it seems.
I have rooted the device and tried to change the csc with the app "Phone info" but that didn't work. Phone info says it doesn't support single csc devices or something.
What else can i try?
What carrier are you with...I don't recognise that code....
http://i.imgur.com/rVnFwJM.jpg
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Indeed it's Polish. I'm not Polish but live in Holland. Got this S5 second hand from a Polish guy.
I just installed CM13 and am happy so far. Gone is all the bloatware. Phone info still says PLS. Not important anymore for now but still looking for a way to change this (in case i want to sell the S5 with a Dutch stockrom).

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

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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