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Wow... look at all the "panic stories" online this week regarding using an iPhone's UDID.

 [[UIDevice currentDevice] uniqueIdentifier]

What SHOULD we be using instead?

What if the phone is sold to another user... and an app has stored some data on a remote server, based on the phone's UDID?

(Of course, I want to avoid the problems with the app store's "encryption restrictions".)