This article is in need of a technical review.
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.
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.