Smartphone e-waste has been largely ignored in the academic literature despite its devastating effects, especially in lower-income countries. This research explores the role of antecedents in consumers’ evaluations of the positive and negative aspects of buying green smartphones and examines the extent to which their evaluation facilitates or inhibits purchase intentions. It also explores the extent to which celebrity endorsement and brand trust moderate the relationship between the antecedents and purchase intentions, presenting a framework based on Stimulus-Organism-Response (SOR) theory and Dual-Factor Theory (DFT) assessing these relationships. A questionnaire was developed based on a literature review, and qualitative data was administered in India using the mall-intercept method. The study found that eco-conscious consumers believe that purchasing green smartphones helps fulfill their ethical obligations, positively impacts perceived consumer effectiveness, and connects with their emotional values. It also found that eco-consciousness was positively related to skepticism towards green claims, perceived quality risk, and perceived personal inconvenience. Consumers with stronger ethical obligations and higher perceived consumer effectiveness were more likely to purchase green smartphones, whereas skepticism towards green claims and perceived quality risk discouraged purchase. Celebrity endorsement was found to moderate the relationship between perceived consumer effectiveness and green smartphone purchase intentions, while brand trust moderated the relationship between ethical obligation and green smartphone intentions, with brand trust overcoming skepticism towards green claims and perceived quality risk inhibitors. The research provides insights and suggestions for smartphone marketing based on the findings.