This API is available on Firefox OS for internal applications only.
oncfstatechange property specifies an event listener to receive
cfstatechange events. These events occur when the call forwarding state changes.
MozMobileConnection inherits from the
EventTarget interface, so it's also possible to listen for events by using the
navigator.mozMobileConnection.oncfstatechange = funcRef;
funcRef is a function to be called when the
cfstatechange event occurs.
Not part of any specification.
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