The device claims AT&T and Verizon only, I’m curious about that…
The Fairphone 6+ is compatible with AT&T and T-Mobile in the US and their MVNOs.
https://us.fairphone.com/the-fairphone-gen-6-plus
Click on “see all tech specs” and under “compatibility” it says AT&T and Verizon.
But it lacks Verizon’s primary band and clearly can’t be used with it.