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It looks like the Xperia 1 doesn't have T-mobile's newest LTE band 71. In addition, the US version doesn't have dual sim support. Can anyone confirm?
According to the US Xperia 1 page (https://www.sonymobile.com/us/products/phones/xperia-1/specifications/) it will not support the Dual SIM variant, but who nows that market better is the local support team, you should contact them: https://support.sonymobile.com/us/contactUs/
Regarding the LTE Band 71 it is indeed not supported by the Xperia 1, you can also see all the supported Bands in the specifications page.
Without band 71 and without dual sim is a disappointment. The cheaper OnePlus 7 Pro has both of those options. Most other flagships in the US all have band 71 so I don't know what Sony was thinking.
I would like to upgrade my XZ Premium but will probably have to skip Sony this time around. Fingers crossed that Xperia 2 has band 71 at least. I was hoping the spec page had an error regarding band 71 but sounds like it really doesn't have it.