S21Fe Network issues

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, interchange Sim in slots, 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.

Your's most welcome to here.

Dear Samsung member,

Greetings from Samsung customer support.

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.

Update device software (If Software update available): https://www.samsung.com/in/support/mobile-devices/samsung-galaxy-smartphone-how-to-update-software/

Reset the device: https://www.samsung.com/in/support/mobile-devices/samsung-galaxy-mobile-how-to-perform-a-factory-res...

In case the issue still occurs, please register your concern in the Samsung Members Application (Open Samsung Members Application > Support> Tap on error report > Type your query > Send).

Warm Regards,
Samsung Customer Support