Stan is a Senior Editor at Mashable, where he has worked since 2007. He's got more battery-powered gadgets and band t-shirts than you. He writes about the next groundbreaking thing. Typically, this is a phone, a coin, or a car. His ultimate goal is to know something about everything.

The TECNO SPARK Slim is the thinnest phone in the world right now, but somehow it still packs a bigger battery than the iPhone 16 Pro Max.

Ultra-thin phones like the Galaxy S25 Edge are quickly heating up. And I'm looking forward to them, but not because of their thinness.

Samsung is one of the companies attempting that with the Samsung Galaxy S25 Edge, a phone that is rumored to be just 5.84mm thick. But having seen the phone on display at MWC 2025, I’m feeling pretty underwhelmed by the design.

How thin can a smartphone really get? If you ask Samsung, it can go as low as 6.4mm – that’s how thick its upcoming Galaxy S25 Edge will be, making it the slimmest phone in the company’s 2025 lineup.