Quote:
Originally Posted by Geekcop
...An ESN is the Electronic Serial Number or identifying number assigned to the device @ time of manufacture. This number is unique to each phone and identifies it on a network. A bad ESN is one that's associated with phone that's been reported lost or stolen. This is also referred to as a blacklisted device. Carriers will not activate a blacklisted device on their network. I believe devices can also be temporarily blacklisted if the user doesn't pay their bill.
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That is true.. An ESN is used for CDMA-only phones also. So if you have a phone from Verizon or Sprint, it has an ESN.. A bad ESN could also be when there are 2 different phones, but they have the same ESN.
Here is some an interesting thread I started that relates to how an ESN can be corrupt.
http://forum.ppcgeeks.com/showthread.php?t=42462