For the record, many phones have been shipped with VoLTE enabled by default, and I’m pretty sure that includes all phones shipped with AweSIM/SIMple.
The issue of no calling tone on outgoing calls has nothing to do with Calls and its version. It’s between the network and the modem. If your network does not provide calling tone in VoLTE, you may still hear it in cases where the phone drops to 3G or 2G.
No.