Aim of research: to examine the prevalence and features of nomophobia among adolescents and its correlation to emotional states of depression, anxiety and stress by overviewing the professional and scientific literature, published studies and survey implementation. Type of research: cross-sectional research. Examinees and methods: the participants were 358 high school students (219 females and 139 males) of all grades who attended the secondary schools in Virovitica. All examinees completed The Depression, Anxiety and Stress Scale (DASS-21) as well as the Nomophobia Questionnaire approved beforehand by parents and school principles. Results: nomophobia is present within 97, 7% of examinees and 29 % of them have got moderately and severely expressed nomophobia. Nomophobia is emphasised more in females than males independently of school and achievement. However, the place of residence affects nomophobia's development. Examinees with recognized nomophobia are more often stressed out, depressed and anxious independently of gender, school or achievement. 11, 45% of examinees have got moderately to severely expressed depression. Moderate to very strong anxiety express 19,55 % of examinees, more often girls and vocational school students while the moderate stress is expressed in 5,6 % of them, also more often within girls independently of school achievement, type of school or place of residence. Conclusion: Mobile phones have become an inevitable part of everyday behaviour of adolescents and according to the results of the research there is a very high frequency of nomophobia. It is moderately/severely expressed in one-fifth of examinees. More difficult levels of nomophobia are more common in adolescents with higher expressed stress and depression. It is essential to do the permanent assessments of nomophobia's level representation in order to develop and implement preventive strategies.