Note: This app is only intended for developersShows you these values, which are all related to identifying an android device.Secure.ANDROID_IDandroid.os.Build.SERIALTelephonyManager.getSimSerialNumber()TelephonyManager.getDeviceId()ro.serialnoWifi MACHas a refresh button (Screen shot outdated) so you can refresh the data and see how values changed / become unavailable.Secure.ANDROID_ID is mapped to ‘android_id’, the hexstring of interest is retrieved byContentResolver contentResolver = getApplicationContext().getContentResolver();Settings.Secure.getString(contentResolver, Settings.Secure.ANDROID_ID)I made this app to explore ways to identify a particular android device. Identification guide can be found in link below:http://android-developers.blogspot.com/2011/03/identifying-app-installations.htmland Stackoverflow question is here with solutionshttp://stackoverflow.com/questions/2785485/is-there-a-unique-android-device-id/3102499#3102499