I have two Pixel 6a phones, purchased at the same time, that exhibit this same problem. When the Wi-Fi calling option is enabled, it turns on and off sporadically. Turning off would be normal when you get out of range of your router, but this happens when I'm in my house with a strong signal. If I'm on a phone call and the feature turns on or off, my call drops.
In testing, I've stayed in the room with my Wi-Fi router, so I have the strongest possible signal and called the phone. I make sure Wi-Fi calling is on, and then I place a test call. At some point, either 30 seconds in or 10 minutes in, Wi-Fi calling turns off and the call is disconnected. The timing isn't consistent, but the eventual disconnect is.
I should also point out that I upgraded these phones from Pixel 4a5g phones. The Pixel 4a5g did not exhibit this behavior and Wi-Fi calling worked great. I'm actually regretting trading in my reliable 4a5g.
I've found turning off Adaptive Connectivity and Wi-Fi calling fixed my call disconnect problems at home. But I'm heading out of country soon and wanted to use the Wi-Fi calling feature.
Both phones were bought unlocked from Google. I've reported this problem to Google support who suggested taking it in for service. I took it to my local ubreakifix/asurion store who didn't think there was anything to replace to fix this problem. I followed up with Google on ubreakifix/asurion's stance and they suggested to mail it in. If it really is a hardware issue, I'd rather have it fixed locally, but the Google rep is unable to tell me what module they would replace if I sent it in.
They also suggested talking to my carrier, hence this post. My understanding is once a device is enabled to use Wi-Fi calling on a carrier (Visible in this case), the actual undertaking of using Wi-Fi calling is up to the device itself. Is there something wrong with the way Visible enabled Wi-Fi calling on their network for the Pixel 6a that could cause this behavior?
I'm also wondering if this is a common problem among Pixel 6a phones?
Is this a problem that can be fixed by replacing some hardware module? If so, which module? I just don't want to waste my time sending a phone in to fix that has a software problem, or some other kind of defect that isn't fixed by replacing one defective module with another defective module.
