An acronym for Unique Device Identifier - on iOS devices, the UDID is a hexadecimal string 40 characters long and not generally known by end users.

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identifying devices using find my phone app

I will try to be specific. - I did receive this e mail: Dear XXXXX, Your Apple ID (XXXXXXX) was used to sign in to the Find My iPhone app on a new device. Date and Time: October 6, 2014, ...
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Are UDID registrations real

There are services like https://udidregistrations.com where you can register you UDID and get Certificates and Provision profiles. Are they worth? What danger is there? Signing applications is real? ...