Apple finally did it – it unveiled its first foldable phone and it is called the iPhone Duo. Arriving many years after the first foldables became available means that the Duo is entering a heavily contested market. Or is it?

The Duo is the third kind of foldable. The first is the large book-style foldables pioneered by the Royole Flexpai and the Galaxy Fold. Shortly after arrived the second kind, the flip phone style, which was suitably introduced by the Motorola Razr. The Duo is a wide foldable, a relatively recent introduction.

Samsung Galaxy Fold • Motorola Razr 2019

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