I have to research deeper to be sure (there is some FAQ at https://fi.google.com/about/faq/#supported-devices-7 https://fi.google.com/about/faq/#supported-devic

I have to research deeper to be sure (there is some FAQ at https://fi.google.com/about/faq/#supported-devices-7 https://fi.google.com/about/faq/#supported-devices-7). But skimming through that page, I suspect this is a new-ish feature not available on most smartphone radios.