Simple application to display different UNIQUE Device IDs

Google Service Framework Android ID
A 64-bit number generated on the device's first log in and remains constant for the lifetime of the device. (Changes on factory reset)

Build.SERIAL
A hardware serial number if available. Usually this value is 'null' or 'unknown'

Settings.Secure.ANDROID_ID (available for Android >= 2.3)
A 64-bit number generated on the device's first boot and should remain constant for the lifetime of the device. ( value may change if a factory reset is performed on the device.)

Using telephony Manager
This is null if device ID is not available i.e. non calling Tablets.

Universal Unique Identifier Generated by this application)
A 8-4-4-4-12 digit hex string that represents a Universal Unique Identifier for the device.