iPhone Duo pre-orders open this week, but 7 questions remain

Pre-orders for Apple's first foldable, the iPhone Duo, open Wednesday ahead of an October 23 release. Apple rates 44 hours of video playback on the outer display and 31 hours on the folding screen, but real-world battery life, nano-texture screen quality, MagSafe accessory fit, the lack of a telephoto lens and long-term durability are still unverified.

• iPhone Duo pre-orders open Wednesday, release set for October 23
• Rated 44 hours of video on outer display, 31 hours on folding screen
• No telephoto lens; zoom is digital "optical quality" only
• Unique shape limits compatibility with existing MagSafe accessories