In today's digitally connected world, smartphone addiction has become a pervasive issue, impacting interpersonal relationships and mental health. As people become dependent on their devices, the constant stream of notifications and social media interactions often leads to phone snubbing, an act where individuals prioritize their phones over face-to-face communication with those around them. This behavior diminishes the quality of relationships while contributing to feelings of isolation, anxiety, and depression. The constant need for digital validation and the fear of missing out (FOMO) have created a cycle of dependence that interferes with meaningful human connections and personal well-being. As smartphone use continues to dominate daily life, understanding the psychological effects of these behaviors and finding ways to balance digital communication with authentic, in-person interactions is crucial. Smartphone Addiction, Phone Snubbing, and Effects on Interpersonal Relationships and Mental Health explores the psychosocial factors that lead to problematic use of technology. It examines the potential risk factors for pathological smartphone use, connections between social media addiction, FOMO, personality traits, and phubbing behaviors, and effects on interpersonal relationships and mental health. This book covers topics such as digital communication, phone addiction, and social media, and is a useful resource for computer engineers, sociologists, psychologists, data scientists, academicians, and researchers.