<p>Nokia smartphones. Of all the manufacturers, Nokia appears to have gone furthest to remove illegally mined tantalum from its supply chain. Photograph: Spencer Platt/Getty</p><p>If you are too well connected, you stop thinking. The clamour, the immediacy, the tendency to absorb other people's thoughts, interrupt the deep abstraction required to find your own way. This is one of the reasons why I have not yet bought a smartphone. But the technology is becoming ever harder to resist. Perhaps this year I will have to succumb. So I have asked a simple question: can I buy an ethical smartphone?</p><p>There are dozens of issues, such as starvation wages, bullying, abuse and 60-hour weeks in the sweatshops manufacturing them, the debt bondage into which some of the workers are pressed, the energy used, the hazardous waste produced. But I will concentrate on just one: are the components soaked in the blood of people from the eastern Democratic Republic of the Congo? For 17 years, rival armies and militias have been fighting over the region's minerals. Among them are metals critical to the manufacture of electronic gadgets, without which no smartphone would exist: tantalum, tungsten, tin and gold.</p><p>While these elements are by no means the only reason for conflict there, they help to fund it, supporting a fragmented war that through direct killings, displacement, disease and malnutrition has now killed several million people. Rival armies have forced local people to dig in extremely dangerous conditions, have extorted minerals and money from self-employed miners, have tortured, mutilated and murdered those who don't comply, and have spread terror and violence including gang rape and child abduction through the rest of the population. I do not want to participate.</p><p><a href="http://www.guardian.co.uk/commentisfree/2013/mar/11/search-smartphone-soaked-blood">Keep reading...</a></p>