From the project description: "We used CDRs from Senegal in 2013, kindly provided by Orange/Sonatel as part of the Data for Development (D4D) Challenge survey data from the Demographic and Health Survey (DHS) in Senegal and a modified small area model."
From the [paper](https://rss.onlinelibrary.wiley.com/doi/full/10.1111/rssa.12305): "The mobile phone data that are used in this paper consist of anonymized call detail records from the Senegalese telecommunication company Sonatel covering the year 2013. The data set is based on more than 9 million unique mobile phone numbers and represents a market share of around 60%. In particular, we had access to the tower‐to‐tower traffic of all 1666 mobile phone towers in Senegal. In what follows we discuss the practical implementation of the processing of the mobile phone data and present details regarding the construction of the mobile phone covariates."
The purpose of this collaboration is to unearth data on literacy in Senegal, as a step to support the achievement of one of the Sustainable Development Goals (SDGs).