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Concept devices dominated Mobile World Congress 2026, with brands showcasing futuristic ideas that may shape future smartphones. Highlights included Tecno Atom, a modular magnetic phone, Honor Robot Phone with a robotic camera arm, and Tecno Phantom Ultimate G Fold, a tri-fold handset claimed to be the world’s thinnest.

Mobile World Congress 2026 was not short on announcements, but it was the concept devices - the ones that may never ship, or ship very differently - that stole the show. From phones that physically move to handsets you snap together like LEGO, here are the most futuristic ideas unveiled at this year's MWC event.

1. Tecno Atom: The modular phone, reimagined

Tecno, presenting under the theme "Pioneering the Connection of Intelligence", showcased over a dozen concept devices and technologies at MWC 2026 to illustrate how smartphones and ecosystems may evolve in the age of AI. The centrepiece was what the brand calls Modular Magnetic Interconnection Technology - a system where users snap hardware pieces onto their phones using magnets, including stackable batteries, action cameras, and telephoto lenses that connect through intelligent connectivity.

Two design interpretations were presented: the ATOM edition, built on the philosophy of "Rational Order with Personal Expression," combining a clear structural foundation with subtle warmth to support efficient, intentional use; and the MODA edition, which adopts a bold, geek-inspired aesthetic. The base device measures just 4.9mm thick, and even when you snap on the 4.5mm power bank module, the total footprint is roughly the same as a standard flagship phone. No commercial release date has been announced. Tecno is framing this as a long-term design exploration.