Hi browbri,
Yeah hopefully it's just the lack of Band 41 and Sprint doesn't deactivate these somehow at a later date (akin to how Sprint iPhone 5 units that were domestic unlocked were re-locked in the last year or so).
I do have one more set of questions if you are game.
Any chance you could report back with the "63.0Xa" text that is to the right of the Sprint logo on your nano SIM (red arrows in pic)? I don't believe it identifies your device in any way. The one that Sprint mailed me says "63.09a"
Or even better, if you still have the full plastic card that Sprint mailed you (from which your nano SIM was removed), could you write back with the Part Number in the bottom left (blue arrow in pic)? Mine says SIMGLW436C like the pic, but there are a few different ones floating around (like that SIMOLW416C one).
Since the phones are back-ordered for 2-3 weeks, I am trying to get my ducks in a row so everything goes smoothly when I finally get one.
Thanks.