In recent years, the market is literally flooded devices transformable structure. Often, even the manufacturers do not know how to categorize a novelty – a distinction between devices such as a tablet and a laptop, monitor, and a candy bar, tablet and smartphone, becomes thinner. Inspired by the trend, the user under the pseudonym Mr. Mulderfox, introduced the concept foldable smartphone Surface Phone – the device is both a tablet and a smart mobile phone also comes bundled with the touch pen. According to the author’s vision, the device must be equipped with a flexible touch screen senses the force of pressing, and holder of the digital pen can execute several additional functions – be an additional external battery, and to act as a stand when the device used in tablet mode. When folded Surface Phone has dimensions of 145×75 mm in the unfolded – 203×140 mm.