This feature is not on a current W3C standards track, but it is supported on the Firefox OS platform. Although implementations may change in the future and it is not supported widely across browsers, it is suitable for use in code dedicated to Firefox OS apps.
onstkcommand property specifies an event listener to receive
stkcommand events. These events are notified whenever STK Proactive Command is issued from ICC.
navigator.mozMobileConnection.icc.onstkcommand = funcRef;
funcRef is a function to be called when the
stkcommand event occurs.
Not part of any specification.