A7 (2018) update to Android 10 broke mobile connectivity.

[mkverma]

One of my friends updated hi A7 (2018) model to Android 10 version today. After the update phone is not showing any mobile network option and it is not registering on any network. Whole basic phone feature is affected. Any reason or quick fix to get rhebphone back to service 

[Anonymous]

Did you updated from official update or downloaded through any 3rd party websites and apps ?

[mkverma]

It was an official update from Samsung delivered OTA.

[Samsung_Support2]

Dear Samsung Member,

Greetings from Samsung Customer Support! 
  
We acknowledge your query and apologize for the same. To resolve your device network issue please visit this link: https://www.samsung.com/in/support/mobile-devices/samsung-galaxy-smartphone-how-to-optimise-network-...

In case the issue still occurs. Please register your concern in Samsung Members Application (Open Samsung Members Application > Get help > Send Feedback > Error report/Ask questions).

Thank you for writing to Samsung.

Warm Regards,
Samsung Customer Support

[mkverma]

The upgrade somehow corrupted the SIM. After replacing it with a new SIM network connectivity was restored.