At the Mobile World Congress (MWC) 2025 in Barcelona, Tecno unveiled the Spark Slim, an ultra-thin concept smartphone measuring just 5.75mm in thickness. This design positions it competitively against other slim devices like the Samsung Galaxy S25 Edge and the rumored iPhone 17 Air.

Key Features:

  • Display: The Spark Slim boasts a 6.78-inch 3D curved AMOLED display with a 1.5K (1224p) resolution and a 144Hz refresh rate, ensuring smooth visuals. Remarkably, it achieves a peak brightness of 4,500 nits, enhancing visibility even in bright conditions.

  • Battery: Despite its slender profile, the device houses a 5,200mAh battery, supporting 45W fast charging. This combination of size and battery capacity is unprecedented in the industry.

  • Camera: The smartphone features a dual 50MP rear camera setup and a 13MP front-facing camera, catering to photography enthusiasts. 

  • Performance: It's powered by an octa-core processor, though specific chipset details remain undisclosed.

  • Design: Tecno showcased two versions: one with a ceramic build and another with a stainless steel exterior. Both variants emphasize a sleek, rounded aesthetic, offering a refreshing departure from the prevalent squared-off designs. 

    Cradit by Google 


To achieve this ultra-thin design, Tecno developed custom hardware components, including a specialized USB-C port and a uniquely designed battery. Notably, the current iteration lacks a SIM slot, likely to maintain its sleek form.

As the Spark Slim is currently a concept device, Tecno has not announced specific details regarding its commercial release or pricing. The company continues to explore the balance between innovative design and practical functionality in its smartphone offerings.