Mobile money is a success story in terms of facilitating account ownership and payments in developing and emerging countries. Today, telecommunication companies offer mobile money services across more than 90 countries. The most popular services are deposits and instant digital money transfers between users. Widespread mobile money adoption is boosting financial inclusion, reducing in transaction costs and facilitating successful consumption smoothing and risk sharing among users. Nonetheless, mobile money is also associated with heterogeneous effects and risks among the poor and vulnerable populations. This article reviews the recent literature on the impact of mobile money in developing countries.