New Delhi, Sept. 10 -- Apple unveiled its first-ever foldable smartphone, the iPhone Duo, at the "Surprise and Shine" event on Wednesday, September 9, marking the largest design change to its flagship product in history.

However, the sleek new Apple device has left seasoned tech enthusiasts feeling a strong sense of deja vu - the iPhone Duo is drawing unexpected comparisons to a cult classic from a bygone era of mobile computing, the BlackBerry Passport.

Unlike the tall, narrow foldable phones that have dominated the market, the iPhone Duo opts for a broader, stouter profile. When closed, its 5.4-inch outer display creates a wide aspect ratio that sits uniquely in the palm of your hand.

It is this specific, pocket-stretching width that...