Relacionar Columnas Materials for technical useVersión en línea What is involved in making a mobile phone? Match the following elements. por Jesús Espinosa 1 What materials is it made of? 2 The outer casing of mobile phones is typically made from... 3 How much does it cost? 4 How big is it? 5 How does it work? 6 What is it for? The average price for a free smartphone is currently anywhere between 400€ and 800€. They work like two-way radios: the phone converts the sounds of your voice into radio signals and transmits them to another phone, which converts them back into sound. Nowadays the average is more than 5 inches long (12.7 cm). plastic (polycarbonate), aluminium and magnesium. Plastic, aluminium and other metals For people to talk to each other from wherever they are.