For the transition toward a circular economy, it is essential that products are returned for reuse, refurbishing or recycling. In order to address the lack of literature on the topic from a user perspective, this paper explores how users can be stimulated to return used smartphones. Taking a Research through Design approach, we developed a novel set of "design for divestment" principles. Divestment is the process users experience when separating from a product. After introducing a conceptual model of divestment based on an extension of the Consumer Decision Process model by Blackwell, Engel, and Miniard, we describe seven empirical studies (i.e., design projects) into smartphone divestment. The studies explore factors that influence a successful divestment process. We report on a highly complex process with interrelated factors changing over time. While it is impossible to define a blueprint for an ideal divestment process, several patterns emerged such as the need to emotionally support users, to give them confidence regarding data security, and to provide information at the right moment. These unique insights contribute to consumer research (i.e., circular consumption); and by translating the insights to ten design principles for divestment, a novel contribution is made to the field of design research. benefit when returning a high-quality product? Related to the quantity of return flows, how can we create a "culture of return," where users routinely seek appropriate modes of disposition after use, e.g., donating at collection points or selling through a take-back scheme?Within the context of CE, this study focuses on design for divestment from a user perspective. It addresses these questions from a Research through Design (RtD) approach. From a design point of view, it is interesting to observe the imbalance between the extensive care put into the design of product purchase and product use experiences, and the careless way in which the final phase of consumption is often designed. We thus ask, can design contribute to creating more valuable and valued divestment processes from the user perspective?Following Gregson, Metcalfe, and Crewe [14] and Glover [15], we use the term divestment to refer to the final phase of the consumption cycle of purchase, use, and divestment. Divestment represents the combination of physical separation and mental and emotional separation processes that users go through when ending the use cycle of a product (see Table 1). Divestment is depicted here as the combination of disposition (i.e., physical separation) and detachment (i.e., mental and emotional separation of the product).