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This ultra-thin 5.75mm phone destroys the Galaxy S25 Edge — and it has a huge battery


Tecno's Spark Slim is the world's thinnest phone, and it has a 5200mAh battery.

Samsung is trying to build interest in the Galaxy S25 Edge by showcasing it behind glass enclosures at tech conferences ahead of its planned launch sometime in Q2 2025, but Chinese manufacturer Tecno managed to steal its thunder at MWC 2025 with the Spark Slim, currently the thinnest phone in the world. (Image credit: Harish Jonnalagadda / Android Central)The Spark Slim has a thickness of just 5.75mm, making it considerably thinner than Samsung's upcoming ultra-thin phone. (Image credit: Harish Jonnalagadda / Android Central)If anything, the plastic back and curved design assist in usability, and while I used plenty of ultra-thin phones in the past, the Spark Slim is notable because of its sheer battery size.

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