I got my phone through my carrier. Unbeknownst to me at the time, carrier provided phones have locked bootloaders so you can’t install grapheneOS on them, or if you can, I haven’t found a guide to reliably do so. The phone was $800 off through the carrier so I can’t complain too much, but I would have got it straight from Google if I had known prior to buying that you can’t install grapheneOS on it.