FINDING THE ESN/IMEI/SERIAL NUMBER ON MOBILE DEVICES
Like most electronics, mobile devices have serial numbers assigned to them at the factory. In addition, mobile phones also have IMEI numbers (short for "International Mobile Station Equipment Identity") that can be used to identify an individual handset. Some mobile phones also have electronic serial numbers (ESN) assigned to them by the Telecommunications Industry of America.
Here are some tips for finding these numbers on a few of the most popular mobile devices.