AT&T started selling BlackBerry’s first Android-powered smartphone, a slider called the Priv, on Friday for $250 with a two-year contract. Priv is a return to the slider-phone style, with a 5.4-in. display. BlackBerry’s dwindling smartphone sales left BlackBerry with just 0.3% of the total global smartphone market in the second quarter. Analyst: “This Priv phone alone won’t save BlackBerry,” Gartner analyst Ken Dulaney said in an interview.”]