With the prospect of reaching billions of new customers, banks and a widening array of non-banks have begun to offer digital financial services for financially excluded and underserved populations, building on the digital approaches that have been used for years to improve access channels for those already served by the formal financial sector. Digital financial services — including those involving the use of mobile phones — have now been launched in more than 80 countries, with some reaching significant scale. Digital financial inclusion involves the deployment of the cost-saving digital means to reach currently financially excluded and underserved populations with a range of formal financial services suited to their needs that are responsibly delivered at a cost affordable to customers and sustainable for providers.