Apple has informed app developers that it will no longer allow apps to use the unique device identifier or UDID after May 1, according to a post on Apple's developer website. Instead, Apple requests developers use the new 'Vendor or Advertising identifiers' that were introduced in iOS 6. Using Identifiers in Your Apps March 21, 2013 Starting May 1, the App Store will no longer accept new apps or app updates that access UDIDs. Please update your apps and servers to associate users with the Vendor or Advertising identifiers introduced in iOS 6. You can find more details in the UIDevice Class Reference.
