Network issue

My dear 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 also restart your's device without any Sim in slots and also Sim interchange in slots than try to it's again. Thanks.

Follow these steps, may they help you

https://r2.community.samsung.com/t5/Tech-Talk/Troubleshooting-Steps-For-Cellular-Network/td-p/13671871?src=ShareByUserCM

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/
Note: kindly contact your network service provider once to make sure there is no issue from their end.

In case the issue still occurs kindly 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