Only Fairphone 4 is currently available in the US via their US partner Murena. While I could get that one, I want to support Fairphone by boosting sales of their current model. If I were to buy one and put in a US SIM card, would I be able to make and receive calls?
Check the 5g frequencies of the phone and the telephone company. Sometimes they differ for some frequency but that does not impact the phone too much. I had an Indian Nord and it worked flawlessly in EU although some frequencies were not supported