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An ESN is the '''E'''lectronic '''S'''erial '''N'''umber assigned to your iPhone and is used with [[CDMA phones]]. The ESN has been tied directly to the phones with CDMA carriers such as Verizon Wireless and Sprint. With the introduction of 4G service, a sim card has now been introduced, however, there remains an ESN tied directly to the phone itself in addition to a number on the sim card.An ESN is the '''E'''lectronic '''S'''erial '''N'''umber assigned to your mobile phone and is used with [[CDMA phones]]. The ESN has been tied directly to the phones with CDMA carriers such as Verizon Wireless and Sprint. With the introduction of 4G service, a sim card has now been introduced, however, there remains an ESN tied directly to the phone itself in addition to a number on the sim card.