Slim Phones Compared: Which One Is Right for You?

The race for the slimmest smartphone has intensified in 2026, with Apple and Samsung unveiling their most compact flagship models to date. The Apple iPhone 17 Air and Samsung Galaxy S25 Edge represent the pinnacle of ultra-thin design, each pushing the boundaries of how thin a powerful smartphone can be while maintaining premium features and performance.

According to hands-on evaluations and technical specifications verified through multiple sources, the iPhone 17 Air measures just 5.5mm in thickness and weighs 146 grams, making it the slimmest iPhone Apple has ever produced. The device features a 6.9-inch LTPO Super Retina XDR OLED display with a 120Hz refresh rate, powered by the A19 Pro chip built on advanced 3nm architecture. It includes up to 512GB of NVMe storage with 8GB of RAM, a 48MP main camera with optical image stabilization and Dolby Vision video recording, and a 3000mAh silicon-carbon lithium-ion battery optimized for power efficiency.

The Samsung Galaxy S25 Edge, positioned as Samsung’s answer to the ultra-slim trend, measures 5.8mm thick and represents the company’s thinnest Galaxy S-series device to date. While specific weight and battery capacity figures for the S25 Edge were not detailed in the verified sources, the phone is confirmed to feature Samsung’s latest processor technology, a high-resolution display with adaptive refresh rate, and a versatile camera system consistent with the Galaxy S25 lineup.

Both devices represent significant engineering achievements in miniaturization, requiring innovative approaches to component layout, battery technology, and thermal management. The iPhone 17 Air utilizes a silicon-carbon lithium-ion battery chemistry that allows for greater energy density in a thinner profile, while maintaining IP68 dust and water resistance. Samsung’s approach with the S25 Edge focuses on reengineering internal components to reduce thickness without compromising the structural integrity expected of a flagship device.

In terms of target audience, the iPhone 17 Air appeals to users who prioritize extreme portability and one-handed usability while still demanding access to Apple’s latest performance capabilities and ecosystem features like Face ID, emergency SOS via satellite, and UWB Gen2 for precise spatial awareness. The Galaxy S25 Edge targets Android users seeking a premium compact experience without switching platforms, offering access to Samsung’s One UI interface, DeX functionality, and extensive accessory compatibility.

Industry analysts note that achieving such thin profiles involves trade-offs, particularly in battery capacity and thermal dissipation. The 3000mAh battery in the iPhone 17 Air, while optimized through software and efficient chip design, represents a reduction compared to previous Plus-sized models. However, real-world usage tests indicate that the combination of the efficient A19 Pro chip and iOS power management delivers all-day battery life for typical usage patterns.

The emergence of these ultra-slim flagships reflects broader consumer preferences for devices that are easy to carry and use comfortably in one hand, particularly as smartphone screens have grown larger over the past decade. Both Apple and Samsung have responded by rethinking internal architecture rather than simply reducing screen size, preserving display real estate while minimizing overall device dimensions.

As manufacturers continue to innovate in materials science and component integration, the sub-6mm smartphone segment may expand beyond current flagship offerings. However, for now, the iPhone 17 Air and Galaxy S25 Edge stand as the most refined examples of balancing extreme thinness with the performance, durability, and feature set expected of premium smartphones in 2026.