I received the free headphones after a request on sony.ch.
They arrived in a fortnight.
I have not tested WiFi calling.

I received no free headphones. Before ordering I registered on sony.ch for the notification when the pre-order (with headphones) was available but received nothing back from them, I notice theres no mention of the headphones on sony.ch now. Wi-fi calling works, I get calls in my cellar where there is no signal.