Phonebloks is a modular smartphone concept created and designed by the Dutch designer Dave Hakkens, primarily to reduce electronic waste. Phonebloks notable due to the extent of its modularity and the attention and support it has garnered. By attaching individual third-party components (called "bloks") to a main board, a user would create a personalized smartphone. These bloks can be replaced at will to replace a broken blok, to upgrade an existing blok, or to expand the functionality of the phone into a specific direction. Bloks would be available in Blokstore, "an app store for hardware", where users could buy new and used bloks as well as sell back their old ones.