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Thank you for your interest in WiFi calling on Android platform. Currently, as you are already aware it's supported only on iOS devices, iPhone 5c, 5s, 6, 6 Plus 6s and 6s Plus on iOS 9. Please stay tune, we keep updating the Community!
It would be nice to see this enabled for Android devices that support it. I thought I saw something recently that they are supporting wifi calling for specific Android devices, but not the Nexus 6p which seems odd given that this is the pure version of Android and should be the easiest to support.
I had an iPhone 6 plus for about 10 months and I am happy to be back on Android. While I would like to get wifi calling activated, when I activated it on the iPhone, I found it to be too aggressive in moving me from the cellular network to wifi. A bigger issue is that when I started a call on wifi, the call would drop if I moved out of wifi coverage rather than automatically transfer the call to the cellular network (even thought here was cell coverage). Not sure if this has been a problem for others.