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.
longName is a read-only property that gives the long name of the network operator.
var operator = navigator.mozMobileConnection.data.network.longName
Return a string.
Not part of any specification.