We’re barely into the third month of 2025, but already, one of the year’s biggest smartphone trends is taking shape: ultra-thin phones. Samsung teased the Galaxy S25 Edge in January ahead of its release later this spring, Apple may have its own thin iPhone in the works with the iPhone 17 Air, and TECNO just announced the Spark Slim.
Samsung and TECNO’s thin phones are aiming for ~6mm or less of thickness, which is undeniably impressive. Visually, the phones look striking, and compared to handsets like the Galaxy S25 Ultra and Google Pixel 9 Pro (measuring 8.2mm and 8.5mm, respectively), it’s no joke how much slimmer they really are.