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A comment on FBI’s Comey Concedes Mistake Was Made Over iPhone in San Bernardino Case. Parent comment

Re:FBI’s Comey Concedes Mistake Was Made Over iPhone in San ... by KMag on Tuesday March 01, 2016 @06:13PM (#11206912)
My understanding is that phone thieves routinely change the IMEI by desoldering and replacing a chip. If this weren't the case, I think it would be fairly easy for detectives to call up the person currently in possession of any given stolen iPhone.
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Re:FBI’s Comey Concedes Mistake Was Made Over iPhone in San ... by tlrobinson on Tuesday March 01, 2016 @06:16PM (#11206939)
Maybe ECID then? https://www.theiphonewiki.com/wiki/ECID
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Re:FBI’s Comey Concedes Mistake Was Made Over iPhone in San ... by theoh on Tuesday March 01, 2016 @06:25PM (#11206977)
It looks like there's something called a UDID which is a SHA-1 hash of a bunch of identifying information. So, difficult to fake even if you can twiddle the source values or swap in new chips.

https://www.theiphonewiki.com/wiki/UDID

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Re:FBI’s Comey Concedes Mistake Was Made Over iPhone in San ... by openasocket on Tuesday March 01, 2016 @06:42PM (#11207081)
Except they have the shooter's phone, which has the identifying information which results in the correct UDID. To get the same UDID on another phone they just need to change the source values to the same values as in the shooter's phone. The fact that it's a cryptographic hash doesn't really help here, assuming they can change all the source values at will.
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