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Well what a difference a day makes from being told it was never going to happen to there it is working. I have a Pixel 3 bought from Googe direct. I installed the Android 9 System update initially with no effect so contacted O2 to get 4G and WiFi calling activated again (previously enabled on another phone) in case that was the problem and they re-applied the bolt-on. Still no WiFi Calling option available on the Pixel 3 at that stage. Then today I checked for further updates and a System Security bug fix release came through which took some time to install and after a restart the WiFi calling option at last appeared in the mobile network advanced settings, switched it on and it worked straight away. Cheers.
Can someone with working 4G/Wi-Fi calling confirm which Android build they're running?
(Navigate to Settings -> About Phone -> Build Number (the very bottom of the list on my device))
I don't have the option for any Wi-Fi calling under Settings -> Network & Internet -> Mobile Network -> Advanced
I've forced my Pixel 3 XL to check for updates and am currently running build PQ2A.190205.001 (Android Security Patch Level: 5 February 2019), but no further updates available.
Can confirm Wi-Fi & 4G calling options are enabled on my O2 account
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