diff --git a/dom/mobilemessage/interfaces/nsIMmsService.idl b/dom/mobilemessage/interfaces/nsIMmsService.idl
index aca7eaaa4e5e..59f9e366c0c9 100644
--- a/dom/mobilemessage/interfaces/nsIMmsService.idl
+++ b/dom/mobilemessage/interfaces/nsIMmsService.idl
@@ -12,9 +12,11 @@ interface nsIDOMBlob;
 #define MMS_SERVICE_CONTRACTID "@mozilla.org/mms/mmsservice;1"
 %}
 
-[scriptable, uuid(e5ef630a-eab7-425a-ac42-650ef5c4fcef)]
+[scriptable, uuid(5dc8b3bc-c3a9-45ea-8ee0-7562b0e57257)]
 interface nsIMmsService : nsISupports
 {
+  readonly attribute unsigned long mmsDefaultServiceId;
+
   void send(in jsval parameters /* MmsParameters */,
             in nsIMobileMessageCallback request);
 
diff --git a/dom/mobilemessage/interfaces/nsISmsService.idl b/dom/mobilemessage/interfaces/nsISmsService.idl
index e3cde07aeb31..4d05bee6b17d 100644
--- a/dom/mobilemessage/interfaces/nsISmsService.idl
+++ b/dom/mobilemessage/interfaces/nsISmsService.idl
@@ -13,9 +13,11 @@ interface nsIMobileMessageCallback;
 #define SMS_SERVICE_CONTRACTID "@mozilla.org/sms/smsservice;1"
 %}
 
-[scriptable, builtinclass, uuid(0f3f75ec-00dd-11e3-87ac-0b1d5c79afdf)]
+[scriptable, builtinclass, uuid(ec3221fb-2d4a-4ccd-ac64-65c1b2dee5dd)]
 interface nsISmsService : nsISupports
 {
+  readonly attribute unsigned long smsDefaultServiceId;
+
   boolean hasSupport();
 
   void getSegmentInfoForText(in DOMString text,
diff --git a/dom/telephony/nsITelephonyProvider.idl b/dom/telephony/nsITelephonyProvider.idl
index d8cb28adc703..cda5e1ba109e 100644
--- a/dom/telephony/nsITelephonyProvider.idl
+++ b/dom/telephony/nsITelephonyProvider.idl
@@ -118,7 +118,7 @@ interface nsITelephonyListener : nsISupports
  * XPCOM component (in the content process) that provides the telephony
  * information.
  */
-[scriptable, uuid(effca006-1ca8-47f7-9bab-1323f90a14ec)]
+[scriptable, uuid(f7680b82-53fc-42a7-9adf-bc0f2726425c)]
 interface nsITelephonyProvider : nsISupports
 {
   const unsigned short CALL_STATE_UNKNOWN = 0;
@@ -136,6 +136,8 @@ interface nsITelephonyProvider : nsISupports
   const unsigned short NOTIFICATION_REMOTE_HELD = 0;
   const unsigned short NOTIFICATION_REMOTE_RESUMED = 1;
 
+  readonly attribute unsigned long defaultServiceId;
+
   /**
    * Called when a content process registers receiving unsolicited messages from
    * RadioInterfaceLayer in the chrome process. Only a content process that has
diff --git a/dom/voicemail/nsIVoicemailProvider.idl b/dom/voicemail/nsIVoicemailProvider.idl
index 4d036386f6ac..115e35cc80ab 100644
--- a/dom/voicemail/nsIVoicemailProvider.idl
+++ b/dom/voicemail/nsIVoicemailProvider.idl
@@ -22,9 +22,11 @@ interface nsIVoicemailListener : nsISupports
  * XPCOM component (in the content process) that provides the voicemail
  * information.
  */
-[scriptable, uuid(37bc0991-21a3-4de9-b888-d667fea6c05d)]
+[scriptable, uuid(38746f3c-f4e3-4804-b900-ba2463b923c8)]
 interface nsIVoicemailProvider : nsISupports
 {
+  readonly attribute unsigned long voicemailDefaultServiceId;
+
   /**
    * Called when a content process registers receiving unsolicited messages from
    * RadioInterfaceLayer in the chrome process. Only a content process that has