Is it actually a special radio, or just features which normally get disabled by e.g. Verizon programming the baseband? I'm assuming that the "special" radios are simply NOT using crippleware and setting some other registers which could be enabled on many more devices...if carriers played ball, which they don't want to for obvious reasons.
I have to research deeper to be sure (there is some FAQ at 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.
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