What is the difference between UDID and UUID? I know that UDID stands for Unique Device IDentifier and UUID is Universally Unique IDentifier but I want to know what role or functionality each one plays.
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Robotic Cat
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This explains it well: Differences between UDID and UUID
UUID (Universally Unique IDentifier), what you call UI - An id that's per app. It's also per install so if a user reinstalls the app it will be different.
UDID (Unique Device Identifier) - Is unique to your phone, it's used by apple mainly and is universal between apps.
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That link is a good find; you should vote to close / flag this question as a duplicate. – Robotic Cat May 14 '17 at 18:49
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@RoboticCat Good idea! Sadly don't have the reputation, although I should just tough it out and get it. – Derimagia May 14 '17 at 22:58