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.
cardState is a read-only property that indicates the state of the device's ICC card.
var state = navigator.mozMobileConnection.cardState
Returns a string representing the ICC card's state. Possible values are:
This property can also be
Not part of any specification.