WebSmsIndicator example

smsIndicator.js

// This example shows the WIP API in https://bugzilla.mozilla.org/show_bug.cgi?id=736710
// Note: mozSms access requires the URL to be in the dom.sms.whitelist
// I tested with the statusbar by adding the "sms" permission category to Gaia's system app in gaia/apps/system/manifest.webapp

var sms = window.navigator.mozSms;
sms.addEventListener("indicator", function onindicator(event) {
  var indicator = event.message.indicator;
  if (indicator.active) {
    // show indicator
  }
  if (indicator.messageCount > 0) {
    // show message count
  }
  // voicemail callback number is in the indicator's owning message:
  var callbackNumber = event.message.sender;

  // some older voicemail systems won't give you an exact messageCount, but they can give a "Return Call" message in the SMS message body
  var returnCallMessage = event.message.body;
  if (returnCallMessage) {
    // display return call message
  }
});