Nowadays, mobile technology is changing the landscape of language learning and is seen as the next frontier being researched for its potential in enhancing the teaching and learning of English language. The portability of mobile devices is believed to bring new methods that can shape learning styles and pedagogies which could become more personalised and allow learners to learn on the move; thus, enhance English language teaching and learning. This creates the potential for significant change in the teaching and learning of English as Second Language (ESL). Taking mobile learning as the setting within which developments in Mobile-assisted Language Learning (MALL) may be understood, this paper offers reflections on what Mobile-assisted Language Learning (MALL) has potentially offered and the constraints that might be faced by the English as Second Language (ESL) learners when using MALL. Above all, it was a challenging issue to cover learning tasks by using a mobile device particularly in learning English as Second Language (ESL). Nevertheless, mobile devices which are popular among students are motivational tools to be used in education as well as various learning activities. This was proven by many researchers who have shown the positive outcomes. Hence, we should admit that mobile devices are finding their way into classrooms in the student’s pockets, and we have to ensure that educational practice can include this mobile technology in effective and productive ways particularly for English as Second Language (ESL) learning.