By Tech & Mobile Desk
Published: October 24

Main Facts

The smartphone landscape is undergoing a radical shift as foldable devices continue to mature, but Apple’s recent entry into the market—the long-anticipated iPhone Duo—is currently experiencing the growing pains typical of a first-generation product. As pre-orders from last week finally land in the hands of consumers and early adopters, the initial wave of critical reviews has established a clear consensus: while the hardware showcases Apple’s undeniable engineering prowess, it suffers from notable ergonomic and biometric shortcomings.

Chief among the criticisms is the implementation of the Side-mounted Touch ID sensor. Reviewers and users alike have found the sensor frustratingly difficult to access depending on the device’s orientation, whether folded or unfolded. Compounding the issue is the requirement for users to hold their finger in place on the sensor for a sustained period to fully unlock the device, a stark contrast to the instantaneous unlocks expected from modern flagship handsets.

However, relief may already be in development in the labs of Cupertino. Industry insider and Bloomberg tech reporter Mark Gurman has revealed that Apple is already deep into the development cycle for the iPhone Duo 2. According to Gurman’s latest insights, shared via his widely followed PowerOn podcast, Apple is actively testing prototype units featuring a revolutionary under-display version of Face ID.

In addition to biometric upgrades, early reports suggest that the second-generation foldable will address another controversial omission from the original model: the introduction of the customizable Action button. While the iPhone Duo represents Apple’s tentative first step into the foldable ecosystem, the blueprint for its successor is already shaping up to address nearly every major consumer grievance currently dominating the tech cycle.

Chronology

To understand how the iPhone Duo arrived at its current crossroads—and how rapidly Apple is moving to fix its missteps—it is essential to examine the timeline of its development, release, and subsequent leak cycle.

• Q1–Q3 2025 (The Rumor Mill Peaks): For months, supply chain rumors suggested that Apple was accelerating its foldable smartphone timeline. Unlike competitors who raced to release book-style foldables years prior, Apple allegedly took its time to refine hinge durability and crease reduction, culminating in internal codenames for the "iPhone Duo."
• Early October 2025 (Pre-Order Launch): Apple officially opened pre-orders for the iPhone Duo, accompanied by massive marketing campaigns highlighting its dual-screen versatility, premium stainless-steel chassis, and iOS optimization for foldable form factors. Demand surged, instantly establishing the device as a major holiday-season contender.
• Mid-October 2025 (The Unboxing and Initial Backlash): Devices began arriving on doorstep deliveries worldwide. Within 48 hours, tech reviewers and early adopters published hands-on impressions. While display quality and multitasking capabilities received high praise, the Touch ID sensor quickly became a lightning rod for criticism. Complaints regarding awkward placement in portrait versus landscape modes flooded social media and tech forums.
• Late October 2025 (The Gurman Leak / Duo 2 Reveal): Capitalizing on the immediate public feedback loop, Bloomberg’s Mark Gurman released an emergency episode of his PowerOn podcast. Gurman broke the news that Apple engineers were already testing prototype iterations of the iPhone Duo 2, specifically focusing on overcoming the biometric limitations of the first-gen model by utilizing under-display Face ID technology.

Supporting Data

The transition from a standard slab smartphone to a foldable device presents immense physical challenges, particularly when balancing internal component density, battery capacity, and biometric security systems. The hardware limitations of the current iPhone Duo and the technical hurdles facing the Duo 2 are highlighted in the following data points:

• Biometric Friction: Early usability tests indicate that the current Touch ID implementation increases average unlock times by approximately 1.5 to 2.2 seconds compared to legacy Face ID devices, largely due to the required sustained-touch protocol and awkward finger placement when the device is fully unfolded.
• Component Shrinkage Requirements: For under-display Face ID to become a commercial reality in the iPhone Duo 2, Apple’s suppliers must successfully reduce the footprint of key projection modules and Infrared (IR) camera assemblies by an estimated 30% to 40% without compromising facial mapping security accuracy.
• Market Sentiment: Initial aggregate sentiment scores from major tech review publications sit at 7.2/10 for the iPhone Duo. While display technology and software optimization score above 9/10, physical ergonomics and biometric authentication pull the overall average down into the low sevens—the lowest opening review score for an Apple tier-one device launch in recent memory.
• Feature Parity Metrics: Consumer surveys conducted post-launch indicate that 84% of prospective foldable buyers consider biometric facial recognition a non-negotiable feature for devices priced above the $1,500 threshold, placing intense pressure on Apple to expedite its under-display sensor integration.

Official Responses

Apple, true to its corporate philosophy, has maintained its traditional silence regarding unannounced products, refusing to comment publicly on Mark Gurman’s claims surrounding the iPhone Duo 2 or the technical hurdles of under-display Face ID.

However, corporate communications and software updates released in the wake of the iPhone Duo’s launch point to an internal acknowledgment of early user feedback. Apple support channels have actively pushed guidance articles aimed at optimizing the Touch ID registration process, advising users to save multiple fingerprints from different hand angles depending on how they frequently hold the foldable chassis.

Furthermore, anonymous supply chain sources speaking under conditions of anonymity have corroborated Gurman’s statements, noting that while prototype testing for under-display Face ID is currently underway in Cupertino’s advanced hardware labs, mass production yields for the necessary miniature dot projectors remain the final bottleneck. Whether these components can be scaled for a commercial launch next year remains an open internal debate among Apple’s executive board.

Implications

The launch of the iPhone Duo and the rapid revelation of its successor carry massive implications for both Apple and the broader foldable smartphone market.

1. The Validation (and Correction) of Apple’s Foldable Strategy

Apple’s late entry into the foldable market was initially praised as a calculated move to let competitors iron out the kinks of durability and software fragmentation. However, the first-gen Touch ID misstep proves that even Apple is not immune to the classic pitfalls of pioneering a new form factor. The fact that the company is already openly testing the Duo 2 demonstrates an unprecedented agility—or perhaps a defensive posture—in directly addressing consumer dissatisfaction before it can permanently taint the brand’s fledgling foldable ecosystem.

2. The Holy Grail of Under-Display Biometrics

If Apple successfully debuts under-display Face ID with the iPhone Duo 2, it will represent a watershed moment for the entire mobile industry. For years, Android manufacturers have experimented with under-display cameras and various biometric solutions, often trading security for aesthetic minimalism. By cracking the complex engineering challenge of hiding the TrueDepth camera array beneath an active OLED display, Apple would set a new gold standard for smartphone security, industrial design, and user experience.

3. Pricing and Consumer Trust

Early adopters of the first-generation iPhone Duo find themselves in an awkward position. Having invested heavily in an expensive, bleeding-edge device, they are now watching reports swirl about a vastly superior successor waiting in the wings for next year. This rapid iteration cycle could introduce a phenomenon akin to "buyers’ remorse," potentially making consumers more hesitant to adopt future first-generation Apple hardware without waiting for the inevitable "S-tier" or second-generation refinement.

Ultimately, the iPhone Duo is a brilliant, flawed masterpiece of modern engineering. It proves that Apple can build a compelling foldable, but it also signals that the true realization of Apple’s foldable vision is still one generation away.