When an Omerta Encrypted SIM is placed in a handset, it installs a small applet called SIM Toolkit. This app contains settings which are required for the service to function & includes a series of profiles which are required for gaining authorisation onto the phone network. 

Even though we do not broadcast the SIM IMEI number, there is still a need for certain properties which are associated with the IMEI number. These parameters are required to gain authorisation to access a cell tower. 

To compensate for not broadcasting the IMEI number, the SIM includes a number of software profiles which includes random parameters which are normally associated with the IMEI number. 

By including these parameters the SIM can still complete the SER authorisation calculation required to get access to the phone network.