Another way to identify devices without using a UDID is device fingerprinting.
FORBES: Apple Will Make It Harder For Apps To Track iPhone/iPad Users
She notes that programming hooks in iOS 6 will provide an alternative to UDID for device-specific data, and that apps will eventually be forbidden from using the older identifiers altogether.
ENGADGET: Apple denies giving FBI any iOS device UDIDs, raises questions over AntiSec claims
First, you need your UDID.
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