In 2010, The Wall Street Journal did an investigative report showing how application developers were using Apple's UDID to gather a lot of personal information about the device owner, including name, age, gender, device location and phone numbers. In response to concerns about the tracking, Apple earlier this year stopped allowing new iOS applications to track UDIDs.
Even before the breach, Apple was warning developers against using UDIDs. started banning apps that used them. Last April we reported that the rejection of several new apps using UDID data from the App Store has lead to concerns that Apple will block iOS apps that use UDID (unique device identifier data).
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