Apple’s iPhone Duo failed JerryRigEverything’s latest durability test. Despite its IP68 dust resistance rating, dust entered the hinge through several entry points, overwhelming the magnets that hold the phone closed. The curvature test then left a permanent green line across the internal screen, before the screen became unresponsive. The exterior screen with Ceramic Shield 2 reached level 7 on the Mohs scale, but the interior screen only managed level 2, although credit was given to its matte nano-texture coating that makes marks “magically disappear.” Unfortunately, it wasn’t enough to earn the pass. “I’ve been testing these foldable phones since the first generation seven years ago; most survive,” Nelson said. “The iPhone Duo didn’t do it.” Watch his full video here. Popular Stories Apple retail staff were asked to warn against walk-in iPhone Duo purchases. Some Apple retail employees have been asked to warn customers not to visit to purchase an iPhone Duo without a pre-order on Friday, October 23. Apple Store employees told MacRumors that they have been informed that there will likely be no iPhone Duo stock available for walk-in purchases on launch day. Staff have been instructed to discourage customers without pre-orders from entering… Here’s what Apple apps look like on the iPhone DuoWith just three days left until the launch of the iPhone Duo, Apple is gearing up for the launch. Behind the scenes, the App Store now has screenshots of Apple’s built-in apps running on the Duo. We’ve seen some apps in marketing materials, but the images we haven’t seen give us an idea of what it will be like to use the iPhone Duo on a day-to-day basis. Many apps are displayed in landscape… Mark Gurman: Apple made a ‘big mistake’ with iPhone Duo pre-orders Despite knowing that the iPhone Duo would face “severe supply constraints” due to manufacturing challenges, Apple decided to start pre-orders for the iPhone Duo on Friday rather than wait until it had more inventory ready, according to Bloomberg’s Mark Gurman. In his Power On newsletter today, he called this decision a “big mistake.” “Let me get to the point: Apple made a big mistake here,” he said…