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. ESNs can be used to check a phone’s history, such as whether it has been reported lost or stolen. They can also be used to unlock a phone so that it can be used with a different 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 or MEID number. Another way is to use a third-party service that specializes in checking ESNs.