Mobile phones play a significant role as a new technology used for the communication in our everyday routine of the individual and their social life. Mobile phones practice affects the assertiveness, morals, ethics, principles and the performances of the university student because of the excess use of phones in their daily life. Students with excess usage of mobile phones have low GPAs as they are giving more time to the mobile phones. The study found that young people have consistently shown higher levels of attachment to their mobile phones. The Purpose of the study was to identify the impact of mobile phones on the learning activities of the University students. The objectives of the study was to investigate the perceived ease of use of smartphones by students in learning activities, Measure the perceived utility of a smartphone in the academic performance of students, to explore the effect of smartphone use on student learning activities. The design is to conduct this study the Quantitative descriptive cross sectional study design was used. This study was conducted in the University of Lahore. The target population for this study consisted of 250 students Questionnaire was used to collect the data. The questionnaires were administered by using convenient sampling. Data were statistically analyzed on SPSS version 21 and inferential statistics. The results of this study showed that the use of smartphones has a positive effect on the learning activities of students in a way that they can easily share lectures with colleagues and record and store all lecture material delivered by the teacher. It also helps in quick access to online information. Easy contact and communication with friends. The study also explored the negative influence of excess use of smartphones on the students' learning activities, such as students use more social networking sites and play games which diverts student’s attention from studies and leads to decreased academic performance. Calls and messaging distract students during lecture hours. Students should be made aware of and informed by teachers and parents on the frequency, number of hours or time spent on cell phone use and affect academic performance. Future research should concentrate on ways to promote learners' deliberate actions towards using smartphones in order to improve the ability to use smartphones to maximize learning performance.