MEID - Mobile Equipment Identifier is a globally unique 56 bits number identifying a physical piece of CDMA mobile station equipment. Equipment identifiers are ‘burned’ into a device, and should be resistant to modification.
MEID is a replacement for ESN (electronic serial number). MEID began replacing ESN in 2006.
MEID number is located under the battery, below the battery, on the back or bottom of the device.