In a world of metal and glass rectangular slabs, the circular Sero smartphone stands alone! The design appeals to audiophiles, offering an ingenious place to wrap headphones as well as a 360 degree hi-fi speaker system. Other peripherals, including a hi-def ProCam and boosted ProSound speaker, can be swapped out depending on each user’s specific needs. As for its compact size, the smart OS apps “grow” in size on the screen the more they’re used, making it fast and easy to nav