I don't know exactly when this happened, but I only found out after some issues with calls not received.
I have aS23 Ultra, 2 SIMs, one from my country, one from abroad.
Was not able to receive calls from 2nd sim anymore, so I went up and down all of my phone settings and found out that my primary sim (nr 1) was not showing its phone number anymore.
To make things worse, the secondary number was appearing as default under my profile, no way to change it, cause it was being read directly. Yes, the second sim was showing its number.
I called my carrier, did a lot of reset and reboots, changed to eSim, but no luck.
Phone seems to somehow carry memory of old sims, cause it won't let me rename the new one (says there's already a Sim with that name, which is the one I removed).
Can't seem to find a way to clear that cache, resetting all network settings didn't work. Sim configuration is correctly installed and I'm all out of options.
Please don't let me go as far as resetting the whole phone...