WHAT IS IMEI ....?

Every handset has a built-in IMEI (International Mobile Equipment Identification) number or ESN (Electronic Serial Number), the phone's unique I.D, normally a 15 digit code. It is usually manually displayed on the box of every new cell phone and can also be found on a label, displayed on the rear inside the phone, behind the battery. With most handsets the IMEI can be retrieved by typing the following code on the keypad: *#06#

IMEI EXAMPLE: 123456786543210

123456 - The first six digits being the (TAC) Type Approval Code. The first two digits is the code for the country approval.
78 - The next two digits is the (FAC) Final Approval Code.
654321 - The next six digits is the Phone Serial Number.
0 - The last digit is an additional number.

With GSM phones the IMEI consist of numbers, and with CDMA phones the IMEI is a combination of numbers and letters.

Click here for to know about  your IMEI details