In the context of the 2017 Uttar Pradesh state assembly elections, a voter information experiment was conducted across more than 3,800 villages in which 450,000 mobile phone subscribers in ‘treatment’ villages received voice and text messages informing them about the criminal charges of candidates in their constituency. The information was credibly sourced and fairly distributed among candidates. Votes for candidates with severe charges dropped by 8% and votes for candidates with no charges increased by 7%. Government should ensure online access to information on the criminal charges of candidates in elections.