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 also 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.
As per your query, kindly follow the easy troubleshooting steps which might help to solve the issue.
● Note: kindly contact your network service provider once to make sure there is no issue from their end.
● Check device network in open area. Check device network mode settings. Please follow the steps: Navigate to apps screen and tap on Settings>> Tap on Connections>> Tap on Mobile networks>> Tap on network mode SIM1 or SIM2>> Select network mode Note: We recommend to set device network mode as 5G/LTE/3G/2G (auto connect) mode.
● Check network operator settings:- Kindly set device network operator as "Automatically". Please follow the steps: Navigate to apps screen and tap on Settings>> Tap on Connections>> Tap on Mobile networks>> Tap on Network operators>> Select automatically>> Note: We recommend to set device network operators as automatically. Tap on OK>>Registered on network.
● Check SIM cards. Kindly do check same SIM card in another phone or another SIM card in same phone to verify the issue.
If the issue persists, kindly report the problems with a log file. To share a log file, click on the Samsung Members Application (Open the Samsung Members Application > Support> Tap on send feedback> Choose Composer> Select Error report > select the appropriate issue category> Type your query and send.)
