Cell phone that is used for multiple purposes and functions across the world is considered as the fastest growing technology of 21st century. This paper surveyed the usability of cell phone amongst the undergraduate students of Kampala University, studying under the School of Computer Science and Information Technology. A survey questionnaire approach as a research method was used to collect data from the respondents. The findings of the study revealed that most of the Kampala University students own smart phones and they are using them to carry out various activities that include calling, sending and receiving email, sending and receiving text messages, scheduling appointments, banking, watching movies, listening audio clips, on line shopping, library, interacting on social media networks, playing nonacademic interactive games, and reading documents.