Apple stopped supporting a unique identifier for iOS. This source code solves the problem. It generates a unique identifier based on the mac address of the device in combination with the bundle identifier.

What you need to do:

• copy NSString+MD5Addition and UIDevice+IdentifierAddition to your project.

• use [[UIDevice currentDevice] uniqueDeviceIdentifier] to retrieve the unique identifier or

• use [[UIDevice currentDevice] uniqueGlobalDeviceIdentifier] to retrieve a global unique identifier (used for tracking between different apps).

• have fun and follow twitter.com/gekitz ;)

//Thanks to Erica Sadun for her UIDevice+Hardware Addition (used for the mac address retrieval).

see license file.