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.

This API is available on Firefox OS for internal applications only.

The dial() method of the Telephony interface dials a phone number and returns a new TelephonyCall object representing the new call.


The new syntax is promise-based, and resolves with the TelephonyCall object for the new call:

myTelephony.dial(number or MMICode,serviceId).then(function(myTelephonyCall) {
  // do something with the new call

The original syntax (Firefox 1.3 and below) was just a regular non-promise method.

var myTelephonyCall = myTelephony.dial(number or MMICode,serviceId);


A string indicating the phone number to dial.
MMI code
A string indicating the MMI code to dial (e.g. *123#).
serviceId Optional
The id of the mobile service you want to use to make the call. If not specified, the default value for the device is used.


A promise that resolves with a TelephonyCall object.


// Telephony object
var tel = navigator.mozTelephony;

// Place a call
tel.dial("123456789").then(function(call) {;


Specification Status Comment
Web Telephony Draft Draft

Browser compatibility

For obvious reasons, support is primarily expected on mobile browsers.

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
Basic support Not supported Not supported Not supported Not supported Not supported
Feature Android Firefox Mobile (Gecko) Firefox OS (Gecko) IE Mobile Opera Mobile Safari Mobile
Basic support Not supported 12.0 (12.0) 1.0.1 Not supported Not supported Not supported
Promise version Not supported 30.0 (30.0) 1.4 Not supported Not supported Not supported

See also

Document Tags and Contributors

Last updated by: chrisdavidmills,