iPhone Duo: the era of Apple’s foldable smartphones has arrived

The reason behind this shift towards wider and less elongated phones is less about aesthetics than it might seem. The traditional clamshell foldable was originally designed as a standard phone that unfolded into a tablet, and to do so it had to remain tall and narrow: when closed, the external screen was an awkward strip; when open, the aspect ratio was unsuitable for videos and really only worked well for two columns of text side by side. The passport-style format, on the other hand, changes the rules. Whilst it is true that, when closed, you forgo the convenience of using just one hand (it is no coincidence that the most frequently used apps are positioned in the area closest to where you hold the phone), when open – thanks to a 4:3 screen ratio – it offers the ideal aspect ratio for watching, reading and drawing.

The fact remains that this is still a small market. According to IDC, foldable phones will account for around 2.2 per cent of smartphone volumes in 2026 and will rise to 3.3 per cent by 2030; the share of revenue is more significant, rising from the current 6.9 per cent to a projected 10 per cent over the same period. These figures point to an expensive niche market rather than a revolution. But it is also true that Apple has only just entered the market, and the Cupertino giant is usually a market mover when it comes to devices.

The real hurdle remains the price: the new iPhone costs over 2,000 euros, whilst the Samsung is just below that. In short, these aren’t exactly prices to suit every budget. But behind these figures lies a complex and costly industrial process. A foldable phone is expensive because it incorporates three components that a traditional phone does not have: a flexible OLED panel with ultra-thin glass, produced with lower manufacturing yields than those of rigid panels; a second display unit, the external one; and a hinge that is a piece of precision engineering. Apple states that its hinge comprises over a hundred components, made from a titanium and aluminium alloy, housed within a Grade 5 titanium frame. An estimate by UBS of the material costs for the Galaxy Z Fold Special Edition put the figure at $790, compared with the $759 estimated for Apple’s first foldable: almost double the cost of manufacturing a conventional high-end phone. Added to this is the fact that low production volumes prevent economies of scale, and that servicing is more expensive, because the inner display is glued to the hinge assembly and repairing one often requires repairing both.

Amidst all this, one detail that is by no means a minor one: the memory crisis. Foundries have diverted production capacity towards high-bandwidth memory for artificial intelligence data centres, leaving the consumer electronics sector to compete for what remains – at significantly higher prices. IDC estimates that memory accounts for between 10 per cent and 15 per cent of the material costs of a top-of-the-range device and between 15 per cent and 20 per cent of a mid-range model; at current prices, these percentages translate into tens of dollars per device.

In short, ‘passport-style’ smartphones seem to have the edge when it comes to innovation, following a long period in which upgrades were measured in millimetres of bezel reduction and additional megapixels. The real challenge they face, however, lies in pricing. For Apple, there is also a question of timing: the iPhone 18 Pro models hit the shops on 18 September, whilst the Duo models arrive on 23 October. A five-week gap between products unveiled on the same day almost always points to a manufacturing issue: how many will they be able to produce? For this reason, the verdict, at least for now, can only be partial. And perhaps, if it proves successful, we’ll only find out from the second generation onwards, when memory prices have stabilised and yields on flexible panels have risen enough to allow for versions priced below 1,500 euros. Until then, this iPhone will remain a product for those who can afford to pay over two thousand euros for a small tablet that fits in their pocket, knowing that the first model in a new category is always the one that comes with the highest price tag.