For a limited time, the iPhone Duo and the iPhone 18 Pro Max will be limited to customers with a pickup reservation at Apple Stores in Japan and South Korea , according to notices posted on Apple’s localized websites for those countries. The notices suggest that the iPhone Duo will not be available for walk-in customers at Apple’s retail locations in Japan and South Korea when the device launches on Friday, October 23, likely due to a mix of supply constraints and Apple’s usual anti-scalping measures in Asia. It is unclear if this policy will extend to any other countries. iPhone Duo pre-orders began on Friday , with shipping estimates on Apple’s online store for newly-placed orders getting pushed back to January 25 within the first 30 minutes of pre-orders starting. In a statement issued later on Friday, Apple said demand for the iPhone Duo was " nothing short of extraordinary " and that it was "working hard" to fulfill orders "as quickly as possible." Apple did not disclose any specific sales figures…