For all app developers out there, take note: Apple will stop accepting apps that use UDIDs after May 1st. Apple is looking to transition all apps over to its own system of Advertising Identifier. Apple introduced this new system along with iOS 6 last summer, and hopes to transition all apps over to Advertising Identifier in the future. Along with the notice about banning UDIDs, Apple is also cracking down on apps that support the iPhone 5. After the same May 1st deadline, Apple will also no longer accept apps that aren’t built for the iPhone 5′s larger 4-inch screen. Apple hopes to encourage all developers to support the new screen size and the new method of ad tracking.
Here is the notice to developers from Apple:
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
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