IMEI Number Guide

What is an IMEI number?

The GSM MoU's IMEI (International Mobile Equipment Identity) numbering system is a 15 digit unqiue code that is used to identify the GSM/DCS/PCS phone to a GSM/DCS/PCS network.

When a phone is switched on, this unique IMEI number is transmitted and checked against a database of blacklisted or greylisted phones in the network's EIR (Equipment ID Register).

This EIR determines whether the phone can log onto the network to make and receive calls.

How to display a phone's IMEI number:

  • Type *#06# on the keypad. This code works on most phones.

What effect does a listing of an IEMI number with an EIR have?

If the EIR and IMEI numbers match, the networks can do a number of things. They can for example greylist or blacklist a phone:

  • Greylisting will allow the phone to be used, but it can be tracked to see who has it (via the SIM info).
  • Blacklisting bars the phone from being used on any network where there is an EIR match.

IEMI Example:



490154  Type Approval Code (TAC)
The first two digits is the code for the country apporval.

10 - Final Assembly Code (FAC)

01,02 AEG
07 , 40 Motorola
10, 20 Nokia
30 Ericsson
40, 41, 44 Siemens
47 Option International
50 Bosch
51 Sony
51 Siemens
51 Ericsson
60 Alcatel
70 Sagem
75 Dancall
80 Philips
85 Panasonic

083781 -  Phone Serial Number

0 -  Additional Number