Obviously, that's not a literal zero, but it's as close to absolute zero as BlackBerry can get. Based on QNX, it launched on Jan. 30, 2013.
In its last earnings report, issued in late December, the company said it sold only 1.9 million smartphones in the quarter -- and most of those were BlackBerry 7 devices targeting emerging markets. Thus, although market research reports on market share differ depending upon who you listen to, a zero percent U.S. market share during that period is quite possible.
BlackBerry launched BlackBerry 10 on Jan. 30, 2013 with the Z10 handset, an all touchscreen handset. It followed that up with the Q10, which included a QWERTY-style keyboard.
Current devices capable of running Blackberry 10 include the Q5, Q10, Z10, Z30 and the P'9982 smartphones.
Also highlighted in the report was the effect the new iPhone 5s / 5c devices in terms of iOS smartphone market share. Apple now has about 48 percent in the U.S. (way up from 34 percent) compared to a drop (from 38 percent) to 31 percent for Samsung. Looking at Android as a whole, though, it's pretty much a dead heat, with Android at 46 percent overall.
Windows Phone was at a mediocre three percent.