Why isn't mobile phone service restricted to emergency numbers only?

Question

The internet via cellular data could be used for all non-emergency phone calls.Why isn't this done?

PaulHoule · Accepted Answer

Voice calls on modern cellular networks are IP-based, seehttps://en.wikipedia.org/wiki/Voice_over_NR

iwanttocomment · Answer

Most cellular calls are already using IP data via Voice over LTE (for 4G), Voice over New Radio (for 5G), or Voice over IP (ie "Wi-Fi Calling") on most American providers. There is an automatic fallback to the conventional circuit-switched mobile network if data reception is not available or the call can't be completed using IP.
The transition to IP calling has been happening since 2012 and virtually all modern phones currently support it - no need to put additional restrictions in place for the edge cases where VoLTE et al don't work.
https://en.wikipedia.org/wiki/Voice_over_LTE
https://en.wikipedia.org/wiki/Voice_over_NR

bell-cot · Answer

Installed base.And (my understanding) either out in the boonies, or when services are running in some degraded modes, that would cut off voice service to non-emergency numbers.

JohnFen · Answer

Why should it be done?

Why isn't mobile phone service restricted to emergency numbers only?

The internet via cellular data could be used for all non-emergency phone calls.
Why isn't this done?

Voice calls on modern cellular networks are IP-based, see
https://en.wikipedia.org/wiki/Voice_over_NR

Installed base.
And (my understanding) either out in the boonies, or when services are running in some degraded modes, that would cut off voice service to non-emergency numbers.

Why should it be done?