This feature is non-standard and is not on a standards track. Do not use it on production sites facing the Web: it will not work for every user. There may also be large incompatibilities between implementations and the behavior may change in the future.
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.