The natural resource mined to produce a digital phone is copper.
The correct answer is copper. Copper is a natural resource that is mined to produce various components in digital phones, such as the wiring and circuitry. To find the answer to this question, you can start by understanding the materials used in the production of digital phones and then identifying which natural resource is required for those materials. In this case, researching the materials used in phones would lead you to discover that copper is an essential resource.
