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Jason Speakman

INEVITABLY, EVEN THE coolest, most unique tech gadget becomes a day-to-day object. That’s the goal, at least. You want to be so familiar with your devices that they become second nature to use, an accustomed shape you can grasp for in the dark or pull out of your pocket and handle without a second thought. If you never get there, you’re not actually using it enough to be worth the investment.

For the first day or two out of my time testing the iPhone Duo , Apple’s debut foldable phone, I doubted I would ever get to that point of comfort. The Duo felt so different than the iPhone 18 Pro Max I had been using for the last month—and from every other iPhone since my first, a 5S in 2013. Reaching for the Duo with its squat dimensions felt awkward, the outer display was harder to scan at a glance, and I didn’t feel compelled to unfold and use the inner displays much at all.…