This API is available on Firefox OS for internal applications only.
Summary
The getDisplayName method is used to get the display name of the voicemail box dialing number of a specified service.
Syntax
var name = navigator.mozVoicemail.getDisplayName([serviceId]);
Properties
serviceIdOptional- A number representing the voicemail service to access.
Returns
A string or null if no number was found.
Specification
Not part of any specification yet.