Apple can’t keep up with demand for the iPhone Duo and there is no timeline for when the company will catch up, Chief Executive John Ternus told Reuters after today’s earnings report. Duo is limited starting today. The ramp is going well and we are working hard to get it to as many customers as quickly as possible, but at this time we cannot predict when supply and demand will be balanced. Ternus commented on the display issues some customers have seen, saying that “a very small percentage” of units have been returned and Apple is offering replacements. iPhone Duo orders placed today have delivery estimates in January and stores have had little stock for online reservations. Last week, Apple said it was aware of an issue affecting the internal display of some units and asked customers who had a problem to contact AppleCare. Apple reported record September quarter revenue of $114.5 billion, up 12 percent from last year. Duo sales are not included because the device did not go on sale until after the end of the quarter. 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 applications are displayed in landscape format… Crackgate? iPhone Duo owners report screens breaking along the hinge. Some iPhone Duos are already experiencing hinge issues causing screen cracks, according to photos shared on Reddit and the MacRumors forums. Almost all of the screen’s flaws are located along the hinge and most result in a line of glowing pixels on one side of the screen. An iPhone Duo owner in Australia said his device cracked after opening it less than 20 times and there was no…