Network issue

Please reset network setting of both Sim one by one and than reset all settings of your's device in general management settings also Flight ✈️ mode on n off one time, restart your's device without any Sim in slots also interchange Sim in slots also turn off power saving mode then try to it's again. If you like please accept as a solution it's help to others users also,click on 3dots in my reply section and click on accept solution. Thanks.

Samsung has to push NR only update to their devices...

Btw you can report this issue on this samsung member app in the support section.
Samsung may take action for this.

If you find my answer helpful, then accept my answer as a solution by clicking three dot menu on my answer post and select 'Accept solution' and help other Galaxy users to find this post helpful 😊

Dear Samsung Member,

Greetings from Samsung Customer Support!

As per your concern, kindly visit this mentioned link to resolve your Galaxy device network issue: https://www.samsung.com/in/support/mobile-devices/samsung-galaxy-smartphone-how-to-optimise-network-connectivity/

In case the issue still occurs, please visit the service center for a physical inspection of your device. You can locate your nearest service center with this given link: https://www.samsung.com/in/support/service-center/

Warm Regards,
Samsung Customer Support