What is the UDID?
The UDID is the Unique Device Identifier your iPhone, iPod touch or iPad. It is made of 40 letters and numbers and should look something like this:
201145b826635fcc902e1a304d137b4492b6f0be
The UDID is constructed from various hardware identifiers such as the device’s serial number. It is guaranteed to be unique for every device but cannot be publicly tied to an user account.
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