The aims of the research were: (1) to find out how high is the
students’habit in using smartphone, (2) to find out how good is the students’
vocabulary competence, (3) to find out whether or not there is a correlation
between students’ habit in usingsmartphone and their vocabulary competence.The
sample of this research was 40 students. The data were collected through
questionnaire and test. Questionnaire is a number of questions which are used to
measure students’ habit in using smart phone, while test is sequence of questions
which are used to measure students’ vocabulary competence. The data were
analyzed by using descriptive correlation study. The writer took the data on 21
June 2014 at the FourthSemester Students of English Department of
Muhammadiyah University of Purwokerto.After the data had been analyzed, it
was found that there was a significant correlation between students’ habit in using
smartphone and their vocabulary competence. It could be seen from the result of
product moment computation where rxy obtained 0.362, the r table for N = 40 at
the level of significance 5% was 0.312. So the result of rxywas higher than r table.
In conclusion, the students who have good habit in using smartphone also have
good vocabulary competence.