using Verizon Note 5 on T-Mobile?

Is this possible?

I just picked up a Verizon Note 5, put my T-Mobile sim in (like I have for tons of verizon devices in the past) and expected it to work, but it does not.

I get no bars with a little X on top. No service. No text/calls/data. I have tried multiple APNs. I've tried global mode, lte cdma mode, lte gsm umts mode. I experienced an issue similar to this on the Verizon Note 4 once it updated to lollipop. However for that Note 4, I put a verizon sim in and that of course worked, so then I took the verizon sim out and put my T-Mobile sim in and it finally worked, as if the verizon sim had to "activate" the phone.

I tried those same steps on this Verizon Note 5 (Verizon sim first - checked internet and it was working with the verizon sim - put in T-Mobile sim - no dice)

I thought all LTE Verizon devices were unlocked? Is anybody here actually using a Verizon Note 5 on T-Mobile or AT&T??