Yep. Before IDFA, apps had access to the device's UDID. In the past you could get it by using this code: [[UIDevice mainDevice] uniqueIdentifier] It was d

Yep. Before IDFA, apps had access to the device's UDID. In the past you could get it by using this code: [[UIDevice mainDevice] uniqueIdentifier] It was deprecated in iOS 5. [1] [1] https://stackoverflow.com/questions/227590/unique-identifier-for-an-iphone-app#comment10515560_227654 https://stackoverflow.com/questions/227590/unique-identifier...