To answer the question about hte SIM card looking slot, it is an R-UIM slot (AKA CDMA SIM CARD)
Since this phone was designed for and released first in China on China Unicom (the largest CDMA carrier in China) and they actually use R-UIM technology in all their phones it makes sence that it has an R-UIM slot.
It will likely remain in the US version and just be inactive much like every Nokia (original not rebadged) CDMA phone has an R-UIM slot in the back aswell.
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To answer the question about hte SIM card looking slot, it is an R-UIM slot (AKA CDMA SIM CARD)
Since this phone was designed for and released first in China on China Unicom (the largest CDMA carrier in China) and they actually use R-UIM technology in all their phones it makes sence that it has an R-UIM slot.
It will likely remain in the US version and just be inactive much like every Nokia (original not rebadged) CDMA phone has an R-UIM slot in the back aswell.