I would be interested too. After making some changes to cust.prop, telephony.xml and vo_config.xml I have VoLTE showing as activated, but in reality it is not working. And lg.ims keeps crashing on Airtel and Jio, but not on Vodafone.Thanks siulmagic for making things easier for us. But would it work for any operator in the world? Im using an officially unlocked t-mobile variant of lg g8 thinq purchased in USA but im using it in India where neither Wi-Fi calling nor volte are enabled for me. Volte setting cant be even found in the settings. Wifi calling atleast is shown but is disabled for me. The volte provisioned setting from the *#*#4636#*#* menu was disabled for me.
Attaching the pics for reference.
1.Extract to Content of zip to Sdcard
2.Make a copy/backup of your own files apns.xml,,custom_apk_list.xml,telephony.xml inside /product/op/config and cust.prop from /product
3.Copy and paste the files from my zip to:
apns.xml,,custom_apk_list.xml,telephony.xml to /product/op/config
cust.prop to /product/op
make sure permissions are 644.
4.Reboot your device it should now be provisioned to your Desired Carrier.