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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 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.Some Android phones and smart phones have extraordinary cameras and make excellent video recorders. hones with good lenses and high megapixel counts can be used solely as portable cameras. Most phones today have Wi-Fi capability and can be used for a variety of things. There are free online services that allow people to send text messages and make calls over the Internet.Some Android phones and smart phones have extraordinary cameras and make excellent video recorders. Phones with image sensors and high megapixel counts can be used solely as portable cameras. Most phones today have Wi-Fi capability and can be used for a variety of things. There are free online services that allow people to send text messages and make calls over the Internet.