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* ESN is an Electronic Serial Number that is unique to each CDMA phone.* The ESN number cannot be legally, nor easily changed.* A phone's ESN is like a fingerprint.Verizon phones are identified by the ESN number when connecting to the service network. The ESN is matched to a massive inclusive database. If the ESN number does not exist in the database, or is marked as bad, the mobile phone will not be allowed to activate with any account, without regards to the status of the account.* An ESN is either CLEAR or BAD* Only a clear ESN can be activated on Verizon.