Again, if VOIP works and VoLTE does not, there is no reason for VoLTE to exist. All calls should be handled as VOIP behind the scenes. Furthermore, there is no reason for voice data to be cheaper or more unlimited than any other data. Data is data. Charging less for VoLTE data just amounts to a subsidy for people who talk a lot paid by other users.
VoLTE is a lower level protocol, and the audio is managed at a kernel level in the phone.
Benefits are gained in latency, traffic and bandwidth shaping, and it is guaranteed. After all, the phone has a single, primary function which must not be impacted should the data stream be saturated.
On a side note,
All of this is for better utilization of spectrum (get more revenue traffic into the same radio spectrum).
Analog -> Digital (1x) was to allow for more traffic in the same radio bands, not because it sounded better. It was actually quite worse.
Digital (1x) -> VoLTE is the step for the eventual migration of people from the current 1x digital spectrum, freeing up that 1x for LTE (less equipment needed by telco). Side benefit is better audio due to better compression and increased data rates.
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