This literature review focuses on mobile phone applications for addiction treatment. Only applications used in combination with a standard treatment were considered. Eleven studies met inclusion criteria. The applications offered information, monitoring, motivational, and relapse prevention tools. Two applications offered more specific psychotherapeutic support. A majority of the studies showed a reduction in consumption following treatment, and this reduction was greater in patients who used an application. The use of smartphone applications in combination with the usual treatment therefore seems to increase the effectiveness of addiction treatment in reducing consumption.