Anti-corruption hotlines provide a key channel for governments to receive complaints from individuals who have come into contact with or been victims of corruption. Increasingly, hotlines are being valued as a channel for citizen redress and as a barometer of the success of government anti-corruption efforts. They provide for broad feedback to governments from civil society on how well policies and institutions are working, where breakdowns occur and where responses are needed. As a service, hotlines are similar to community audits and legal advice centres in offering a means to cross-check whether campaign pledges and government promises are producing results. Yet their success in combating corruption is dependent on a number of operational, administrative, institutional and political factors — each of which this paper will attempt to address by drawing on examples from Azerbaijan, Czech Republic, Kenya and Moldova.