Disabling 4G Calling does not prevent these headers from being revealed, and if your device is ever unreachable these internal headers will still reveal the last cell you were connected to and how long ago this was.
One annoyance with O2 UK is that they don't support VoLTE for legacy pay-as-you-go customers, only pay-monthly. Now I'm actually kind-of glad for that.
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Could you mitigate this by turning off VoLTE? I can see docs online for turning it off on an iPhone 11 - but my iPhone 15 doesn't have that option!
So it seems like that won't do anything.
One annoyance with O2 UK is that they don't support VoLTE for legacy pay-as-you-go customers, only pay-monthly. Now I'm actually kind-of glad for that.
Coming second half of this year!
Cool, hopefully before their wide-scale 3G switch-off starting August.