The iPhone Duo may have two screens, but it may be designed with only one hand in mind.

Apple unveiled its first-ever foldable iPhone Wednesday, marking the biggest physical overhaul of its signature smartphone since the original iPhone first hit the market.

But the flashy $1,999 device has left left-handed users quick to point out a design flaw in the soon-to-be-released smartphone they fear could make it awkward or even “unusable.”

The tech giant touts the device’s largest-ever inner screen: a 7.6-inch display alongside a 5.4-inch outer screen, and its dynamic weight of just over half a pound. The titanium phone folds down to just over 3…

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