This article aims to support Word Learning CET-6, which is one of an application on mobile phone helping ELF students to learn English vocabulary. It is an application that has limited of words. Word Learning CET-6 is similar a mobile dictionary that the author intends to create the new way to help EFL students learn English vocabulary easier way. The author proves that how application can be helped in learning English vocabulary by testing two groups of students, separating to a test group (using Word Learning CET-6) and a control group (not use Word Learning CET-6). Testing knowledge of English vocabulary has two times which are pre-test and post-test. The result from testing with two groups represents that a test group gained new vocabulary more than a control group. Therefore, it means that mobile phone as an intermediary that is effective devices for learning and comforting to use in real life.