This research investigated the effect of Smartphones' applications on developing EFL speaking skills of sixty first secondary school students from the Egyptian Islamic  English Language school, Sharqeya Governorate, Egypt in the academic year 2020- 2021. They were equally divided into an experimental group and a control group. This study adopted  quasi-experimental  design using a pre-post tests. The experimental group was taught by the use of Smartphones' applications while the control group received  regular teaching . The results indicated that the students who were taught using smartphones' applications showed an enhancement in their speaking skills.  On the contrary of the control group. Therefore,  smartphone's applications positively affected  EFL speaking skills of  secondary school students.