T-Mobile band 12 on Axon Pro a1p, a2015, a2016

I'm looking for a phone that supports T-Mobile Band 12 VoLTE and the Axon Pro variants are right in my price range and look great. Can anyone confirm that band 12 on T-Mobile is working for them? Also can someone explain the differences between each of the varients? Is the a1p the US version, a2016 the european, and a2015 the chinese?

Thanks!

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