Arabic language has not been mastered by most of Indonesian people, even though Islamic teaching urged Moslems to learn it. On the other hand, smartphone communication technology, WhatsApp (WA), has potential to be used to learn Arabic. This is due to WA’s functionality to be used by multiusers, or to discuss in the same time. Besides, WA has several supporting features to be used as means of learning, i.e. transferring voices or pictures. WA is a quite economical media for communication, and this feature made WA is commonly used by Indonesian peoples. With these special characteristics, it is expected that Indonesian Moslem community, who largely own this application, may increase the number of people learning Arabic.