The International Mobile Equipment Identity (IMEI) is a unique number. It is used to distinguish 3GPP and iDEN mobile phones. It is typically found printed inside the battery compartment of the phone. The IMEI can likewise be displayed on-screen on most phones by entering *#06#. GSM networks utilize the IMEI number to distinguish valid devices, and can prevent a stolen telephone from getting on the network. If a phone is theft Or lost, then portable administrators are urged to take measures like quick suspension of administration and replacement of SIM cards in case of loss or theft.