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In sub-Saharan Africa, the vast majority of businesses belong to the so-called “informal” sector. As of yet, little is known about their take up of the mobile phone, which suddenly and massively emerged in their daily operations within less than a decade. This article, which is based on an original study of 500 entrepreneurs in the informal sector in Dakar, combines quantitative and qualitative methods. Its contribution is threefold. First, the study provides broad and detailed empirical insight into the adoption and use of mobile phones by informal entrepreneurs in sub-Saharan Africa. Second, the article draws on an original survey and analysis methodology to propose a robust and comprehensive typology of these entrepreneurs’ business uses of mobile phones. Finally, it provides a statistical analysis of the relationship between mobile phone uses and economic performance. Ultimately, this article seeks to contribute to a better understanding of the informal sector and its specific dynamics.