Today, with the enhancement in the usage of smartphones, the concepts of nomophobia and phubbing have emerged. Nomophobia refers to the fear of being deprived of smartphones/smart devices. Phubbing is the use of a person's smartphone in situations that are not appropriate for the situation, time, and place. Therefore, the study purposed to evaluate nursing students' nomophobia and phubbing scores in Turkey, Portugal, and the United States. The data were collected with the Personal Information Questionnaire, Nomophobia Scale, and Phubbing Scale from N = 446 nursing students. The mean age of the students was 22.04 ± 4.08 years, and 86.5% were women. It was found that the total nomophobia scores of the nursing students were 80.15 ± 21.96, 72.29 ± 28.09, and 99.65 ± 6.11, respectively in Turkey, Portugal, and the United States. When the countries' Nomophobia Scale total scores, "giving up convenience," "not being able to communicate," and "losing connectedness" scores were compared with each other, they were found to be statistically significant ( P < .05). When the countries' Phubbing Scale total scores and all subscale scores were compared with each other were found to be statistically significant ( P < .05). It is seen that nomophobia scores were moderate (60 ≤ NMP-Q nomophobia ≤ 99) and phubbing scores (<40) were below the level indicating addiction in all countries.