Hello, here is a piece of code that can used in the development of an android app to get the unique device id Step 1. Make sure to include the following line of code in the import/header section of the MainActivity.java file. import android.provider.Settings.Secure; Step 2. Define a private variable and get the unique ID with the following line of code private String DeviceID = Secure.getString(getContext().getContentResolver(),Secure.ANDROID_ID);