Apple-এর executive John Ternus, Molly Anderson, এবং Steve Lemay GQ ম্যাগাজিনের সাথে iPhone Duo-এর ডিজাইন নিয়ে আলোচনা করেছেন, কাগজের নোটবুককে মূল প্রভাব হিসেবে উল্লেখ করেছেন। Ternus Steve Jobs imaginatio technology aur liberal arts ke intersection ka reference diya, kehte hue iPhone Duo perfect example hai. Anderson, Apple ki industrial design vice president, samjhaye ki lakshya tha pocket mein notebook jaisa mahsoos karna jab bhi compact aur usable ho. Device ke proportions international A-series paper system se inspire hain, jo A5 se nearest hain, bhi Apple closed state mein passport-sized describe karta hai.

Lemay, human interface design vice president, seamless software integration ko emphasize kiya, jo unfold karte samay operating system switch feel karne se avoid karna chahata hai. Hinge mein custom variable torque profile hai jo smooth opening aur stable flat positioning ke liye hai. Team ne paper notebooks ki convenience emulate karna seekha tha, jabki kuch naya bana rahe the, iPad, Macintosh aur existing iPhones se seekhe huye seekh ko blend kiya.