For the US version, you can only get the 8/128 on that page. There is "technically" a 256 US version that was in the works but the codename never made it out and it didn't go to market. Same as a Gold color for Asian markets...
So to clarify, here's all the 7T variants:
Global / International / Asian / Chinese - missing US bands, available as both 128 and 256 <--- DON'T GET THIS
US T-Mobile - available as 128, locked bootloader <--- DON'T GET THIS
US Unlocked - available as 128, unlocked bootloader <-- YES, GET THIS
Here's some clarification on the provisioning. Simple version is these are the features that are added and/or removed from your account based on your subscription choices and hardware support. Premium Visual Voicemail, for example, costs $2.99 per month. When you choose to add this to your phone, VZW "provisions" your account to add support for the feature. There's also provisioning that's required to support iOS devices... or LTE... or WiFi Calling, etc. So although the 7T has been whitelisted (
link) and can be activated on VZW, some of the provisioning isn't automatic and you'll need a quick call to Tier 2 support to get all the phone features working.
Here's the steps. First, if you're moving from an iPhone... there's a small chance things can get hairy when/if you're planning to use Dual SIM (two discrete phone lines). If you are, let me know, I'll add some details. If you don't plan to activate two lines, then here's the easiest path coming from an iPhone:
1) turn off iMessage on your iPhone (very easy, google it).
2) not required... but if you can, it actually makes life easier if you first transfer your line to an old Android LTE device. This can be done online and doesn't cost anything. What this does is push some provisioning to your account that sticks around when you then activate the 7T. If you're already on Android, you can skip these two first steps.
3) then call VZW, ask for a Tier 2 tech to activate the 7T.
4) confirm "CDMA-Less" provisioning has been added.
5) confirm "HD Voice" provisioning has been added.
6) Optional... but you can also ask them to remove the "LVC-Block" provisioning that gets added automatically when they populate your IMEI number (for Video Calling).
All set. The only item that isn't working yet is Premium Visual Voicemail (transcribed to text). Visual Voicemail works. Also, if you know how to do it, you can activate RCS messaging.
I think that's about it... good luck!