I can say say first hand that pf5 works in the us. At the time I used T-Mobile, but no problems with connectivity.

T-Mobile is based in Germany, so cell service is still functional between continents.

Currently I don’t have T-Mobile, but have the murena esim, they do utilize the T-Mobile network though. Haven’t been in the US with the esim, but I can still use it fine on wireless or roaming

Elon Musk should privatize his face