In a major announcement Apple has informed developer community that it will no longer allow apps to use the unique device identifier or UDID. This policy change is effective from May 1, according to the Apple’s developer website.
The developers are now required to use the new ‘Vendor or Advertising identifiers’ which is introduced in iOS 6. Developers are now required to support both the Retina display and the conventional iPhone 4-inch display, from May 1.
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.
Starting May 1, new apps and app updates submitted to the App Store must be built for iOS devices with Retina display and iPhone apps must also support the 4-inch display on iPhone 5. Learn about preparing your apps by reviewing the iOS Human Interface Guidelines.
This development is not completely unexpected, because in 2011 Apple announced that they will be phasing out developer access to UDID’s and instead will provide a non-identifying marker for advertisers to use. There were rumors which speculates that Apple was already rejecting apps for the use of the UDID, this announcement just made it public.
The developer community should be wary of this this change and adapt accordingly.