An Electronic Serial Number (ESN) is a unique identifier assigned to every cell phone. It is used by carriers to identify and track devices on their networks. The ESN can be used to check a phone’s history, such as whether it has been reported lost or stolen. It can also be used to unlock a phone if it has been locked to a particular carrier.
There are a few different ways to check a cell phone’s ESN. One way is to contact the carrier and provide them with the phone’s IMEI number. The IMEI number is another unique identifier that is assigned to every cell phone. The carrier can then look up the ESN associated with the IMEI number.