The applet communicates with the mobile terminal via the standardized SIM-ME interface.
Upon detection of the handset switch, local information is collected and sent to the central server via Unstructured Supplementary Service Data (USSD) message or Short Message Service (SMS).
The transmission is carried out in transparent mode. The applet will attempt to use USSD bearer whenever possible, failing back to SMS in case the USSD is not supported/available.
If SMS is unavailable, the applet will store the data packet and will send it once the MS is back in coverage.
The applet operation will not adversely affect the handset battery life. The subscriber policy is handled by the central processing server.