"Get Smart About Smartphones" is a custom intervention program, informed by the Theory of Planned Behaviour, which aimed to help youth athletes reduce their smartphone addiction levels. The intervention program comprised of a group workshop, followed by a series of reminder messages to help reinforce the lessons learnt during the workshop. 23 Singaporean youth athletes (aged 13-19 years) participated in the intervention program, and were assessed at pre, post, and follow-up timepoints for their objective and subjective measures of smartphone use. After the intervention program had concluded, a smaller sample of eight participants were selected to participate in semi-structured interviews to get their views and feedback on the intervention program. The results showed that while there were no significant differences in the objective measures of smartphone use (i.e., duration and frequency) between the timepoints, there was a significant reduction in the subjective measure (i.e., SAS-SV) of smartphone addiction in both post and follow-up timepoints. This was supported by the multiple case study analysis, which found that participants were able to implement the various strategies that were taught during the intervention program, and that those strategies were able to help them reduce their level of smartphone addiction. Overall, participant feedback for the intervention program was positive, with participants stating that it was fun, interactive, relatable, and informative. There were still some barriers that prevented participants from reducing their smartphone addiction levels, and suggestions were given on how to improve the intervention program in future.