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.
lastKnownMcc is a read-only property that represents the Mobile Country Code (MCC) of the last known network operator.
var dataMCC = navigator.mozMobileConnection.data.lastKnownMcc; var voiceMCC = navigator.mozMobileConnection.voice.lastKnownMcc;
Return a number.
Not part of any specification.