These days, the innovations of technologies are contributing significantly to the quality of education in spite of their limitations. Mobile technologies are rapidly attracting new users, providing increasing capacity, and allowing more sophisticated use. Since they are becoming very accessible for individuals in most parts of the world, it has a great role in facilitating learning both in formal and informal context. Due to this, Mobile Learning (ML) was introduced and attracted the attention of educators in various academic institutions. When it comes to language learning, it is termed as Mobile Assisted Language Learning (MALL) approach as a way to be considered in the environment language learning. In line with this, various studies have been conducted in the contributions and related factors of MALL. Thus, this review carefully analyses the nature, the principles, the merits and demerits, and the challenges and opportunities with their pedagogical implications in the second or foreign language learning context.