Android Id Info

Note: This app is only intended for developers

Shows you these values, which are all related to identifying an android device.

Secure.ANDROID_ID
android.os.Build.SERIAL
TelephonyManager.getSimSerialNumber()
TelephonyManager.getDeviceId()
ro.serialno
Wifi MAC

Has a refresh button (Screen shot outdated) so you can refresh the data and see how values changed / become unavailable.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 by

ContentResolver 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.html

and Stackoverflow question is here with solutions

http://stackoverflow.com/questions/2785485/is-there-a-unique-android-device-id/3102499#3102499

Tags: android ro.serialno, ro.serialno android, android.os.build.serial, android id, "ro.serialno".