The Rise and Fall (and Potential Rise Again) of Ultra-Thin Phones

Ultra-thin phones were a major trend in 2025, with manufacturers competing to create devices that felt remarkably slim and light. Still, barely a year later, the focus is shifting. Samsung recently unveiled the S26 range without the anticipated upgraded Edge variant, and rumors suggest Apple won’t be updating the iPhone Air this year either.

The Problem with Prioritizing Thinness

Although aesthetically pleasing, ultra-thin phones reach with significant compromises. Devices like the iPhone Air and Samsung Galaxy S25 Edge offer a refreshing feel in the hand, a departure from the bulkier 2026 flagships. However, this slimness often necessitates trade-offs in key areas.

Compromised Camera Hardware

Camera hardware frequently suffers in ultra-thin designs. The iPhone Air’s single rear camera is an example, offering adequate performance for everyday photos but lacking the versatility of more advanced flagship phones, even those at lower price points like Apple’s iPhone 17. The physical space required for components like telephoto lenses limits their inclusion in ultra-slim devices.

Battery Life Concerns

Battery life is another major challenge. The limited chassis volume restricts the size of the battery that can be included, leading to more frequent charging, battery anxiety, and a lack of all-day confidence. This trade-off – paying a premium price for a device with reduced functionality – is likely a key factor in Samsung’s decision to move away from the Edge brand.

Tecno’s Modular Approach: A Potential Solution

Tecno’s concept Atom device, showcased at Mobile World Congress (MWC) 2026, presents an intriguing alternative. At just 4.99mm thick, it’s among the thinnest phones currently available. The device utilizes what Tecno calls Modular Magnetic Interconnection tech, allowing users to attach hardware modules as needed.

How Modular Tech Works

Tecno’s concept allows users to expand functionality without permanently compromising the phone’s design. Modules can be attached to the camera housing, below it using magnets, or via a POGO system at the bottom of the device. Available modules include a telephoto camera, an extended battery pack, and a dedicated microphone with a wind shield for content creators. This approach allows for a slim and minimal design most of the time, with the option to add features when required.

Challenges and Future Outlook

Despite its promise, Tecno’s modular system is still a concept. Wider release plans haven’t been confirmed, and the magnetic attachment system needs refinement to ensure secure, everyday use. However, the concept demonstrates a potential direction for the industry.

If ultra-thin phones are to make a comeback, they need to avoid forcing users to sacrifice functionality. Modular designs, like Tecno’s, offer a compelling path forward. The industry needs to find a way to bring this technology to market before the ultra-thin movement fades entirely.