I reached out to Project fi personnel and was told that WiFi calling (like AT&T) would not be provisioned on the Amazon exclusive V35 ThinQ. I told them that the advertising on their site was misleading as there was no disclaimer regarding absent access to WiFi calling unless you purchase the phone direct from them. This after multiple emails, online interactions from fi, and reboots and tweaks prescribed by them. So $700 from Amazon vs $900 from them. Awaiting higher up corporate response to my inquiry.