Android is an open platform. It has very rich applications. This paper combines Android platform and telephone to study and design an application of making and receiving calls on the Android platform to make it has the function of telephone dialing. Android platform and telephone are connected by the control circuit with analog switches CD4052. The telephone dial-up function in Android system can be implemented by writing a driver in Linux kernel, generating dynamic libraries in JNI and HAL and creating application in the application layer. After testing, the design of the dial-up application can successfully dial the number.