If you hear this term most probably you are trying to activate the device with a carrier, but that’s not possible due to some reasons.What is a Bad ESN?Ī Bad ESN can mean a lot of things, let’s check out some examples: Cellular, so if you are with any of these carriers you have an ESN number attached to your device. there are some carriers that work on CDMA network: Verizon, Sprint, U.S. The IMEI thus also serves a security purpose.ĮSN stands for "Electronic Serial Number" and it’s a unique number for each device that works as a way of identification of a CDMA device. An iPhone can’t be used with a different SIM card unless you make a visit to the Apple Store or where ever the iPhone was purchased from. The IMEI is much like a Social Security Number, but for phones. It’s a 14 to 16 digits long number and it’s unique for every iPhone and it’s the identification of your device. IMEI stands for "International Mobile Equipment Identity". Part 1: Basic information about IMEI number and ESN What is IMEI number?
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