The networks in my Samsung Galaxy S21+ have vanished after the last update. Initially the battery was discharged from 100 to phone shutting down after 15 minutes of the update. Upon restarting the network bars were there but eventually the networks have vanished. I've tried factory resetting but it's not there. At one time there was network and I could call but it was Wi-Fi calling. As soon as the WiFi disconnected the networks disappeared again. So it's just a device now which can be used only with WiFi and not otherwise. I've tried wiping the cache partition and resetting networks settings but nothing has worked so far.
Kindly complaint to Samsung customer support through Samsung Members App as error report also send log files Along with this error report for this issue. Then go to service center for resolves this issue. 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, we request you kindly share the log file. Also, share video clips and images for better understanding. This will help us to further investigate and resolve this issue.
Samsung Members Application (Open Samsung Members Application > Support> Tap on error report > Type your query > Send).
Note: To ensure relevant log information is included in the error report, submit the report within 3 minutes of encountering the bug or error, and do not terminate (swipe away) the Samsung Members application until you are notified that the report has been sent. This can take up to 5 minutes.
