Early December, the peak sales season. You are sitting at a formal dinner with a key partner to finalize a contract for the coming year. At one point, your interlocutor pulls a shiny foldable phone out of his pocket to show you a sample process in your joint service. He opens your flagship app, and on the 7.6-inch screen, the interface breaks apart like a failed accordion. Black bars appear on the sides, and the confirmation button is hidden under the keyboard. The partner smiles politely and remarks with subtle sarcasm: “Looks like you missed something…”
The foldable phone market is entering an acceleration phase. Industry leaders like Apple, Samsung, and Google are setting new interface standards today. They are turning a niche trend into a powerful, rapidly growing business opportunity. Devices of this type land directly in the hands of executives, investors, and key business clients. These users generate the highest lifetime value (LTV) and are the least forgiving of UX shortcomings.
The market launch of the iPhone Duo and the upcoming sales peak before Black Friday present product teams with a concrete challenge: what will a user who invests in the latest flagship devices see on their screen?
The Wide-Screen Standard Is Becoming a Market Norm
The design of the iPhone Duo utilizes a 5.4-inch outer display and a 7.6-inch inner screen – similar in size to the parameters known from the Samsung Galaxy Z Fold series. Market evolution clearly points to a division of roles: quick glance actions and simple tasks take place on the outer screen, while advanced operations, data analysis, finance, and shopping move to the full unfolded view.
These changes are supported by operating system providers. Google’s Android 16 guidelines require apps to correctly scale and support responsive layout features starting from late August 2026.
Western Europe is emerging as one of the most important strongholds for the new generation of smartphones, with this market experiencing a dynamic surge in competitiveness in the first half of 2025. An example of growing demand is the German market, where the Galaxy Z Fold7 achieved sales 67.3% higher in H1 2025 compared to its predecessor.
Anyone who thinks this is a marginal trend will soon lose ground to the competition. Globally, foldable smartphones reached 19.6 million shipments in 2025 according to Counterpoint data (1.6% of the smartphone market). For 2026, IDC forecasts growth to 22.9 million devices (+12.6% YoY). Counterpoint predicts roughly 20% growth with Apple holding around a 28% share. Cumulative shipments will exceed 100 million devices by the end of 2026. Apple’s market launch of the iPhone Duo acts as the ultimate catalyst here. Waiting for mass adoption means ignoring that the most profitable customer segment already holds these phones.
Who Is the Person on the Other Side of the Screen?
Think of Thomas, a fund director in Geneva and a key private banking client. Thomas uses a foldable phone as his main travel computer. In a taxi to the airport, he keeps the screen unfolded in split view. On the left half of the 7.6-inch screen, he analyzes portfolio performance in real time. On the right, he tries to approve a critical currency transaction. For him, a smartphone is a work tool under time pressure.
If the bank’s interface breaks, the session expires, or the security prompt gets covered by the keyboard, Thomas won’t close his account overnight. He will just get extremely annoyed. He will lose precious time re-entering data and abandon the incomplete transaction. With every subsequent UI crash, his frustration will grow along with the feeling that his bank has fallen behind technologically.
An expert perspective on interface development takes into account the specifics of this user group: high propensity for multitasking: Users of large-display devices heavily utilize multi-window modes and native system capabilities to handle two processes simultaneously.
Foldable devices land directly in the hands of executives, investors, and high-net-worth premium clients. This is a group for whom the mobile app becomes a primary tool for work and purchasing, and any interface errors or lack of responsiveness strictly translate into abandoned transactions and lost trust from your most valuable users.
Potential Market Expansion: Data Speaks to Small-Screen Fatigue
Foldables may start as premium devices, but their potential extends far beyond the wealthiest users. Data from Europe shows something more important: users don’t necessarily want to leave their phone when a task gets more complex. Often, they simply lack space on it.
A recent Samsung study across key European markets – including France, Germany, the UK, Italy, and Spain – shows the scale of this problem. 69% of Europeans declare interest in a phone that unfolds into a larger screen. A staggering 85% of users start a task on a smartphone but finish it on a larger device, and 29% point to limited screen space as one of the main barriers when using a phone.
This changes how we should look at foldables. It’s not just about making the app look good on a bigger screen. It’s about asking how many tasks we finish on a laptop or tablet today that we could perform directly on a phone in the future.
If extra real estate allows the user to see more context and perform more steps without switching devices, the phone ceases to be just a screen for quick interactions. It becomes a full-fledged workstation. And that is precisely why, for product teams, foldables aren’t just a new breakpoint. It’s potentially a new paradigm for app usage.
A Stretched Interface Is Not Enough
The most common mistake? Treating a multi-screen device like a small iPad. The dev team simply stretches the smartphone layout horizontally and leaves huge blank margins. As a result, the app looks sparse, and the customer faces a lot of empty space where nothing happens.
The advantage of a large screen lies in eliminating unnecessary clicks for the customer:
- Browsing and cart in one place: The customer sees the product on the left and immediately has a preview of the cart and payment methods on the right. They don’t switch screens, get lost, or hesitate – they simply buy.
- More context on a single screen: Price, specifications, reviews, availability, and other key details can be visible simultaneously. The customer doesn’t have to jump back and forth between views to make a decision.
- Fewer transitions, shorter path to purchase: On a small screen, the user navigates through sequential steps. On a large display, you can show them context, decision, and action all at once.
- Lower drop-off rates: Greater convenience and more data in a single view directly translate into higher order values, especially among people who don’t have time for complicated app navigation.
What Breaks Most Often in Apps?
Mobile apps grow sprint by sprint, accumulate technical debt, and rarely have perfectly clean code. During our testing at Tapptic, we most frequently encounter four recurring issues on multi-screen devices:
- Buttons hiding under the keyboard: The “Buy Now” or “Authorize” button ends up beneath the virtual keyboard or beyond the screen edge.
- Session wiped after unfolding: The customer unfolds the phone halfway through a form, the app reloads from scratch, and the cart resets to empty.
- Flat charts and broken analytics: Financial charts render as a flat line, and margins obscure crucial data.
- Non-standard menus: Custom navigation bars fail to re-position to the side and cover half the screen.
Right before Black Friday and the end of the year, a misstep on a VIP client’s screen is an easy way to hand high-value transactions over to the competition.
Let’s Test It on Your App
You don’t need to plan a month-long overhaul to know where your product stands. Developer tools and simulators for foldable devices are ready, and our engineers test apps on them daily.
If you want to know how your key screens behave when unfolded before your first clients or board members see them, let’s do a quick check. Contact us: hello@tapptic.com.
