Imei code?! What is that?

[Realist]

I've been reading and hearing about something like an imei code? What is that?

IMEI code is a 15 digit number, which is UNIQUE (well suppose too) for every mobile phone on the whole world.
You can look at it as the fingerprint of a mobile phone. To see the IMEI code from your phone you can:
-Check the sticker under your battery
-Press *#06#, your phone has to be on with simcard!

Some more deep going info about the IMEI code.

Below shows you what every bit of your IMEI number tells you about a mobile phone.
The information below is for any IMEI number.
XXXXXX XX XXXXXX X represents an IMEI number.
XXXXXX XX XXXXXX X
TAC FAC SNR SP
TAC = Type Approval Code (first 2 digits = country code of the approval-country )
FAC = Final Assembly Code
(01,02 = AEG)
(10,20 Nokia)
(40,41,44 Siemens)
(30 Ericsson)
(50 Bosch)
(51 Sony,Siemens,Ericsson)
(60 Alcatel)
(65 AEG)
(70 Sagem)
(75 Dancall)
(80 Philips)
(85 Panasonic)
These number are not always correct anymore.

SNR = Serial Nr.
SP = Spare, this is a checksum. The outcome of a calculation which check if the IMEI is a valid number.