At MWC 2025, Tecno unveiled its Spark Slim smartphone. While the company calls it a concept device (read: prototype), it is reportedly preparing for a "staggered launch" later this year. Regardless, after brief hands-on time with the phone, I can confidently say this is how thin phones should be done.

Chinese technology company TECNO unveiled a new concept smartphone at the Mobile World Congress (MWC) in Barcelona: the SPARK Slim, billed as the world's thinnest smartphone at just 5.75mm thick. Greenland: Why is it valuable?

Tecno Mobile showed off a concept device that measures 5.75mm thick and called it the industry's slimmest device. Meet the Spark Slim.