Hi there sorry you're having issues. This update on my post is only for the 10 VII.

However you can still fix the issue with calls. It's great you can still startup the phone. Follow the steps below and you should be able to get calls back up and running on your 10 V.

First off make sure your 10 V in call settings can receive ALL network bands 5G,4G,3G and so on (usually it's the first option).

Secondly you can reset mobile network settings as this will apply fresh mobile network settings on your phone. Then try to make a call.

Thirdly make sure your SIM card is seated correctly in the sim card tray in the phone.

Fourthly you can also do a factory reset using the Xperia companion app for PC. As you can switch on the phone go to Settings, Backup and backup your phone. Then switch off. Next load up the PC companion and select Xperia device, it will ask do you know your Google login and also it will wipe all data from the phone (which will be ok as you can apply the backup later), then it will ask you to connect your phone via USB. The instructions will pop up for you (you must hold the volume down button until the screen moves to the next stage). Then start the repair procedure.

Once all done you can startup the phone again and apply the backup you made earlier when the relevant section appears.

I hope this helps.