I don't understand why not having Band 71 concerns people on T-Mobile.
If Band 71 didn't exist for T-Mobile at all would there be concern?
T-Mobile has three other bands and people report blazing speeds on those bands. No one has reported (yet) a blazing speed on Band 71.
What is it you are missing when you have Band 2, 4 and 12 already?
It wouldn't because T-Mobile would continue to expand on the other three bands. This is a big deal because T-Mobile has made the point that they are no longer expanding coverage on the other three bands and are going to exclusively expand on Band 71, this band is the only one that will be supporting 5G when they switch over in 2019 (which is not too far away). What comes in these Band 71 towers are also the newest Ericcson equipment that supports the 5G.
If your in an area that already has Band 71, which is quite a few areas across the US, you are already missing out on this new Band that will very likely be supported in next year's phone.
Sure you have coverage with the 3 bands that T-Mobile has all over, but your effectively not getting anything new as far as coverage either now and the future.
It won't matter if you plan to upgrade every year, but if your the type that wants that $1000 dollar phone to be as futureproof as possible (assuming your getting the X), well, your not getting 5G when it rolls out, or coverage in new areas, or better coverage in existing areas as Band 71 also has better penetration through walls. You better be prepared to spend $1000+ dollars again when a new phone comes out that supports the new band is available.
That's why it matters.
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There's no phone out now that supports band 71? This is a non-issue.
There is no phone out there that supports band 71, but is the future, and T-Mobile is rapidly deploying it across the nation and there are already states that have it already deployed... this is literally more of a "complete rollout across US" by June 2018. This means phones will have access to it.
You buy the phone today, you are locked into the 3 "older" bands and you forget about getting 5G on your phone in the future when they activate it in 2019.
I thought this would be a "T-Mobile will take their time converting stuff until maybe 2020 when it will be usable", but it's not. There is already Band 71 operating now, and they are quickly rolling it out in more and more states that will be ready by WWDC in 2017. This is much more "near term" than what others thing. Depending where you live, you can take advantage of it now.
Sure the VX30 is the only phone that supports it, but that doesn't mean that if you buy phones that don't support it now, you won't have to upgrade next year if you want to take advantage of it. We already know it's here, its rolling out more, and your device is outdated the day you buy it.