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Comment by walterbell

3 days ago

> that toggle is enabled for my carrier... but only on iOS

WiFi calling with SIM1 number via SIM2 data has always worked on iOS, so I was surprised when it didn't work on Pixel.

This is the “Backup calling” toggle in Pixel IMS, and carriers are fond of blocking that function.

(TIL: Vo“WiFi” over wired Ethernet over USB doesn’t work on AOSP or Pixel and never did, for no apparent reason except noöne caring to make it work.)

The part that does not work on iOS is putting SIM2 into airplane mode so that it can do VoWiFi without connecting to the network. That would reduce power consumption and avoid utterly obnoxious behavior on the part of some carriers (cough, Visible).