Samsung's upcoming tri-fold smartphone was showcased in late October, but it's still not properly official. We might not have very long to wait, however, as it's now apparently been spotted in the Bluetooth SIG's certification database. Interestingly, multiple model numbers were certified - SM-D6390, SM-D639N, SM-D639U, SM-D639U1, and SM-D639B. The fact that we have all these model numbers implies rather wide geographical availability, including in North America, China, and Korea. The model ending in "B" is generally Samsung's global version of a device, but of course that doesn't...
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