Most students spend a great amount of time on their smartphones. The current research aims to figure out the prevalence of mobile addiction among college students studying in the city of Ranchi. A total of 120 students from different colleges were randomly chosen and their age ranged from 18 to 22 years. Nomo phobia is a form of behavioral addiction towards smart phone referring to the anxiety caused by disconnected from the mobile network to have access to a smart phone. Nomo phobia has multi-dimensional traits ranging from social, physiological and physical symptoms that are summarized into very dependency upon smartphone. The mobile addiction scale (Kwon, Kim & Yang, 2013) and nomophobia questionnaire (Yildirim & Correia, 2015) were administered. As a result of a research found that smart phones were addicted to an unprecedented 40.83 percent of the sample picked. There were equal levels of mobile phone addiction in male and female students. Nomophobia among student Smartphone users was not affected by gender and age. Smartphone addiction prevention techniques have been delineated.