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Are you saying that the GSM frequencies used in the US are not supported by Fairphone hw?
I know there are CDMA and GSM telkom companies but I assumed the re are plenty of common frequencies
https://www.theverge.com/2023/7/5/23783714/murena-fairphone-4-us-release-date-price-sustainability-repair
Apparently just starting a few months ago, you can get fairphone in the US through Murena.