I did it. I even talked to two representatives to make sure everything was fine. The other also advised me to take the phone to the lab to fix it. I realized that this is a known problem in devices bought abroad by the way, according to Google the mobile company can add the missing settings with a simple app. There is even an example here: https://source.android.com/devices/tech/config/carrier
At least on Oneplus devices you can upload an mbn file using Qualcomm's PDC tool as listed here: https://www.xda-developers.com/enable-volte-vowifi-asus-zenfone-8-oneplus-9-pro/ The problem is where Get the right firmware? There is already a long list of supported vendors that can be run from PDC, but as you said none of them are from Israel.