There’s a few things to unpack that make this far more complicated than it should be.
The simple stuff for the 2x GSM networks in the US:
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AT&T have this pdf of supported devices
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T-Mobile doesn’t have anything as comprehensive, I guess in part as they’re still to fully combine Sprint. However, this link allows you to check the IMEI of your phone and flags any phone that doesn’t support VoLTE:
Despite buying my Sailfish licence from the UK, this will affect me as I’m now in a US resident, so this will affect me as my XA2 won’t work as a phone in around 9-15 months time, regardless of the SIM inserted. T-Mobile flat don’t support my XA2, see the following screenshot.
Interestingly my old Nokia 830 is apparently supported on AT&T after this change, despite being a launched more than 3 years earlier. I guess that’s due to the XA2 not being a contract option on T-Mobile, or for that matter available at retail in the US (only the Xperia 1 & 5 are available on Amazon, the 10 II is the International version).
Where it gets messy is that the supported LTE bands are very different to Europe in the US. As Sony don’t sell phones that support Sailfish X in the US, importing one is the only option but that doesn’t necessarily help as the Xperia 10 series supports some different LTE bands to the network. The XA2 Dual-Sim I have supports 1-5,7-8,20,38, and AT&T has widespread use of bands 12&17 so if I’m in an area of the US where only band 17 is available, the phone won’t work at all.
The point is that I understand why Jolla don’t support Sailfish X sales in the US, as the phones that support it aren’t available to buy in the US without importing, and doing so doesn’t mean LTE will work. Thta doesn’t mean I’d like to see VoLTE support soon but I understand why it’s not a priority.