The idea of a small, ‘pocket-sized’ phone is not so modern as we first perhaps thought. In 1917, Finnish inventor Eric Tigerstedt, filed a patent for a telephone that could be folded and fit into a pocket with a very thin carbon microphone.
Today, up to 50 different metals are used in very small amounts which enable the user with different functionalities and are small in size in light in weight e.g. loud speaker magnets are made with new technology metals neodymium and dsyprosium. Cobalt and lithium are used for the battery, indium for the LED display, and gallium for the processor.