Mobile phone addiction is the obsessive use of a mobile phone that negatively affects the physical and mental health of a person. The main cause of mobile phone addiction is internet addiction disorder in which the technology purposely keeps its users engaged through various applications and games. Emotional regulation and depression are the risk factors associated with the addiction of internet and smart phones. Chronic phone usage leads to conditions, such as GABA dysfunction, decrease in grey matter in the brain and depression. There are several methods of treating addiction to mobile phone and internet, which include counseling, group therapy, group support, cognitive-behavioral therapy, psychotherapy, motivational interviewing and medication-assisted treatment. This book examines the risk factors of mobile phone and internet addiction along with its assessment and treatment methods. Researchers and students actively engaged in this field will find it full of crucial and unexplored concepts.