The iPhone Duo arrives on October 23. A million people pre-ordered it. Every one of them will unfold it, spend 5 minutes going “wow,” and then spend the next 30 days using it exactly like their old iPhone unfolded for everything, draining the battery by noon, ignoring the outer display, never adjusting a single setting, and wondering why a $1,999 phone feels like an expensive iPad mini that makes calls. A tech journalist who’s been using a pre-production iPhone Duo since early September 6 weeks of daily, all-day use learned something the hard way that she wishes someone had told her on day one. “The iPhone Duo has a learning curve Apple doesn’t warn you about. Not a technical curve a behavioral one. You have to unlearn how you use an iPhone. The instinct to unfold for everything kills the battery and wastes the outer display. The instinct to hold it like a slab ignores the hinge that’s a tripod, a kickstand, and a tent. The instinct to use the front camera for selfies throws away the 48MP rear camera system designed to replace it. And the instinct to ignore Settings means you’ll miss the Shift Left Edge display hack, the dual-battery optimization, the nano-texture writing surface, and the StandBy upgrade that turns a $1,999 phone into the best bedside clock Apple’s ever made.” She documented the 11 daily-use tricks she learned in 6 weeks that transform the iPhone Duo from “big phone I keep unfolding” into the device Apple actually designed. Here’s the second wave of hidden iPhone Duo features the ones you discover after the first week 🧵