It's wild when I'm talking to family on Signal, which seems to run high quality VoIP even on a non-VoLTE-capable phone. (and the hardware seems to be VoLTE-capable, just Sprint never released the appropriate modem firmware _in my market_, and I've been unsuccessful at hacking apart a rom from india...)

But as nice as the quality may be, the latency still sucks. It's just the nature of the beast.