The International Mobile Equipment Identity (IMEI) number is a unique identification or serial number that all mobile phones and smart phones have. It is normally 15 digits long. It can also be displayed on the phones screen by entering *#06# on the phones keypad.
The IMEI number is used by a GSM network to identify valid devices and therefore can be used for stopping a stolen phone from accessing that network. For example, if a mobile phone is stolen, the owner can call his or her network provider and instruct them to “blacklist” the phone using its IMEI number. This renders the phone useless on that network and sometimes other networks too, whether or not the phone’s SIM is changed. Mobile operator can also disable mobile phone remotely if phone is reported as stolen or lost (and if reporter asked them to disable this phones IMEI). IMEI numbers are hard-coded into device hardware, making it nearly impossible to change them without somehow damaging the device.
Some phones have fake IMEI numbers. The easiest way to check the validity of an IMEI number manually is by using the Luhn formula for verification of identification codes.
Conversely, one can calculate the IMEI by choosing the check digit that would give a sum divisible by 10. For the example IMEI 91124005405611?
To make the sum divisible by 10, we set ? = 4, so the IMEI is 911240054056114.
As per Government of India Directive, handsets with non-genuine IMEI will stop working on all networks by 30th November 2009
In case of an invalid IMEI
- Visit only authorized GII (Genuine IMEI Implant) centers, set up on Government approved process, which can implant new genuine IMEI on the handset.
- Pay a nominal charge of 199(all inclusive) and obtain a receipt.
Carry your handset with a valid identity Proof for identification purposes while visiting these centers