Use Mobile data for VoLTE calls via secondary SIM
I have purchased Asus Rog Phone II in the month of Jan '20, since then I have been using two SIM cards, JIO & VODAFONE.
I became a big fan of the feature "Use Mobile data for VoLTE calls via Secondary SIM", though I had a combination of VoLTE 4G+ Advanced LTE on Jio and just 4G on Vodafone in my circle, with the data enabled on Jio in SIM 1 slot. When I used to make calls using the non data enabled SIM which is Vodafone, automatically it used to switch the data to onto Vodafone 4G with a H or H+ symbol.
This feature worked fine until I received Android 10 update on the phone, since the update version: 17.0240.2004.9 and version before that with Android 10, this data switch feature stopped working irrespective of location where I am taking calls.
More over, I have been having serious issues on Vodafone number, I do not get the calls. It appears to be switched Off most of the time unless I switch the data to Vodafone.
I have contacted Vodafone carrier, raised a complain which went until porting to Airtel with a last minute cancellation with assurances given by Vodafone, They have replaced the SIM card 3 times, changed the plan and also got my number re-activated as a fresh customer. Nothing worked.
This issue started only after the Android 10 update, where in I started to have issues with Incoming calls on vodafone though I have the network it appears as switched off and also the feature "Use Mobile data for VoLTE calls via secondary SIM" which used to work with a combo of VoLTE 4G+ Advanced LTE on Jio and just 4G on Vodafone, data switching stopped working.
Kindly suggest on these two issues. I have performed Network reset and restored the phone as well to factory defaults.