Update 1: 2018/02/26 7:07am PST
Looks like T-Mobile's press release wasn't entirely accurate, as the V30, V30 Plus, and S8 Active should all support Band 71/600MHz. The article has been updated to reflect this.
Samsung announced the Galaxy S9 and S9+ yesterday, but the news for T-Mobile subscribers doesn't stop there. Turns out the new Galaxy phones support team magenta's new 600MHz band 71 LTE. So if you've got your heart set on taking advantage of the frequency's extra coverage and penetration in the coming years, then the S9 and S9+ are your best bet right now.
T-Mobile's band 71/600MHz spectrum is a recent acquisition for the company, and it's a big deal for the company's subscribers.Read More
[Update: T-Mobile's PR was misleading] Samsung Galaxy S9 and S9+ among first phones to support band 71 LTE was written by the awesome team at Android Police.