The main characteristics of mobile learning (m-learning) are recognized as the potential for learning process to be personalized, spontaneous, informal and ubiquitous. Although learning through mobile phones may take longer time compared to computers, the learners feel a greater sense of freedom of time and place, so that they can take the advantage of spare time to learn a second language when and where they are. Mobile-Assisted Language Learning (MALL) deals with the use of mobile technology in language learning. In contrast to classroom learning, in MALL there is no need for the learners to sit in a classroom or at a computer to get learning materials. In fact, MALL can be considered an ideal solution to language learning barriers in terms of time and place. In this paper by looking at some applications of m-learning as well as some examples across various aspects of it, we observe the advantages and disadvantages derived from using mobile technologies for students as well as professionals. Here, it has been tried to demonstrate the benefits of using mobile phones in learning English as a second language. Areas of mobile-based language learning discussed in this paper are vocabulary, listening, grammar, phonetics, and reading comprehension.