A few threads on here about Apple CarPlay's Siri not working while on Data only. Seems to be mostly 2018's. We have a 2019 and it's intermittent. I've had an iPhone 5 work but 2 6S's would not. Tried an X that worked but two XR's do not. They all work when at home on our WIFI and of course it always works at the dealer! All of our phones work with every other brand tried, and we've had rentals and they all work perfectly. In fact they all work in our 2017 Ridgeline. I'm tired of having to book appointments that have a 30 day wait just to have someone say it's the phone. So my question is, do you have a working Siri when no WIFI is available? Imagine yourself on a country road where internet does not even exist, does it work? What phone and what carrier?