Where are the cheapest and most expensive countries to own a mobile phone?

Eight in 10 people in the developing world own a mobile phone, but the cost of using mobiles varies significantly. The 2016 World Development Report explores the impact of the Internet and mobiles on human development.

If you're interested in exploring this data a bit further, I put together a dashboard using the original data source (Table 4.2 in the ITU's Measuring the Information Society 2015 - PDF link). Since extracting data from a PDF isn't always error free, I take responsibility for any "transcription errors" - but having looked it over a couple of times, I don't see anything obviously amiss.