Smartphone addiction refers to a behavioral condition that involves the obsessive use of a smartphone. It is often fueled by an internet addiction disorder. The addiction occurs due to electronic gadgets, as well as the applications, games and internet that connect the people with virtual world. The symptoms of internet addiction disorder manifest in both physical and emotional forms. Depression, isolation, agitation, defensiveness, no sense of time, avoidance of work, fear, loneliness, procrastination, mood swings and anxiety are some of the emotional symptoms of internet and smartphone addiction. Some physical signs and symptoms include backache, insomnia, neck pain, weight gain or loss, dry eyes and other vision problems. Cognitive behavior therapy, group therapy and psychotherapy are some common treatment methods for internet and smartphone addiction. This book provides an evidence based approach to help develop a better understanding of internet and smartphone addiction. It is a resource guide for experts as well as students.