Mobile Phone Boards (logic boards and printed circuit boards/PCBs) are the core components inside smartphones, controlling the processor, memory, battery management, and communication systems. These boards contain valuable materials such as gold, silver, palladium, and copper, along with advanced microchips and integrated circuits. Due to their high concentration of precious and rare metals, mobile phone boards are an important source for recycling, refining, and recovering valuable resources. They are found in all generations of smartphones, from older devices to the latest models.