Every single cell phone in the world has a unique built-in IMEI (ESN) number. Phones are verified on the celltrace system via this electronic I.D
DID YOU KNOW? Your mobile phone has a unique digital I.D, referred to as IMEI or ESN. 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.
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