How can I retrieve the UDID on iOS?

Question

I was wondering if it was possible to find out the UDID of the user's iPhone. Can someone shed some light?

Answer 1

Note: Apple will no longer accept apps that access the UDID of a device starting May 1, 2013.

Instead, you must use the new methods identifierForVendor and advertisingIdentifier in iOS 6+ for accessing this. See related post here for more detail.

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Old way (deprecated and will result in App Store rejection)

NSString *udid = [[UIDevice currentDevice] uniqueIdentifier]; 

As of iOS7, the uniqueIdentifier property is no longer available.

See the UIDevice reference.