Chinese smartphone maker Tecno has unveiled a bold new concept that could signal the return of modular phones to the mainstream market, debuting its ultra thin modular smartphone idea ahead of the upcoming Mobile World Congress (MWC) 2026 in Barcelona.

The concept, built around what Tecno calls “Modular Magnetic Interconnection Technology,” reimagines hardware expansion without the bulk that plagued earlier modular experiments like Google’s Project Ara.

Rather than traditional slide in components and visible ports, this approach uses ultra thin magnets that let accessories snap onto the back of the device and connect wirelessly via Wi Fi, Bluetooth, and mmWave technologies.

At its core is an impressively slim base smartphone measuring just 4.9 mm thick — thinner than many flagship handsets. Even with additional modules attached, such as a 4.5 mm magnetic power bank, the combined thickness remains comparable to typical modern smartphones, addressing a longstanding criticism of modular designs.

Tecno’s concept leans toward a flexible accessory ecosystem rather than allowing users to swap out core internal components like processors or batteries. The company has introduced around ten snap on modules, including an action camera aimed at content creators, a telephoto lens that uses the phone’s display as a viewfinder, and tools designed for off grid communication.

Two design variants will be showcased at MWC — the ATOM edition with a refined silver aluminum finish and the MODA edition with a more expressive, tech inspired aesthetic. The rear panel is highlighted by eight modular zones to clearly guide accessory placement.

Tecno has not confirmed release dates or pricing, describing the modular smartphone as part of its long term design vision rather than a ready to ship product. Nonetheless, the concept points to a renewed emphasis on adaptable hardware that lets users customize their devices based on needs rather than fixed specifications.