In this chapter, we present an approach for mobile learning that aims at equipping learners by portable MP3 players. As known, the primary use of this device is to listen to music in MP3 format, but it can be adopted to be a useful tool for the service of teaching/learning of languages. This method is based on an easy to use technology that makes it possible for learners to work, at their own pace/rhythm, the oral comprehension of a foreign language. It is a question of supporting the personalization (but not only) of what audio files (short, long) each user should listen to. These files are created by the teacher and uploaded on a Web based distance-learning platform. So, these audio resources are available permanently on the server and can be downloaded by learners at any time. The proposed method is designed for a diversified population and allows the development and the maintenance of knowledge throughout the life.