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A promising strategy to reduce smartphones' environmental footprint is to increase their service lifetime, thereby reducing the demand for resource-intensive production of new devices. Most of the existing literature focuses on production-oriented measures, such as improving repairability, but what remains missing is a systematic overview of consumer-oriented interventions to extend smartphones' service lifetime. In this study, we applied the consumer intervention mapping approach by systematically identifying consumer decision situations along the smartphone life cycle and interventions that encourage consumers to make smartphone lifetime-extending decisions. We identify two main mechanisms to achieve lifetime extension: retention by increasing the time during which a user keeps a device, and recirculation by passing on a device to an additional user. Altogether, we identified 26 different types of …