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Changing CSC on the SM-G991B/DS model

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Hello, I bought my S21 device from Singapore but I live in Egypt, I tried changing my CSC or service provider to EGY in order to unlock call recording through flashing Egyptian firmware with no luck even though I have an Egyptian SIM card inside.

Any suggestions? I tried the code *#272*IMEI NUMBER# and I got options to change the CSC but next to EGY there was the word "single". Does that mean that if I choose it I will lose the DUAL SIM functionality?

Thank you.

EDIT: changing CSC on my SM-G991B/DS worked flawlessly with the code mentioned above.
 
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Hello, I bought my S21 device from Singapore but I live in Egypt, I tried changing my CSC or service provider to EGY in order to unlock call recording through flashing Egyptian firmware with no luck even though I have an Egyptian SIM card inside.

Any suggestions? I tried the code *#272*IMEI NUMBER# and I got options to change the CSC but next to EGY there was the word "single". Does that mean that if I choose it I will lose the DUAL SIM functionality?

Thank you.

EDIT: changing CSC on my SM-G991B/DS worked flawlessly with the code mentioned above.
Hi

Yes , I did it too and is working great , dual sim included , I think the option "single" is not relates to the dual sim option but to change the sales code , last one of the csc codes, xxx/xxx-xxx/ country code