--- a/dom/system/gonk/ril_worker.js
+++ b/dom/system/gonk/ril_worker.js
@@ -2603,16 +2603,23 @@ let RIL = {
         command.transactionId = 0;
         break;
       case STK_EVENT_TYPE_IDLE_SCREEN_AVAILABLE:
         command.deviceId = {
           sourceId: STK_DEVICE_ID_DISPLAY,
           destinationId: STK_DEVICE_ID_SIM
         };
         break;
+      case STK_EVENT_TYPE_LANGUAGE_SELECTION:
+        command.deviceId = {
+          sourceId: STK_DEVICE_ID_ME,
+          destinationId: STK_DEVICE_ID_SIM
+        };
+        command.language = command.event.language;
+        break;
     }
     this.sendICCEnvelopeCommand(command);
   },
 
   /**
    * Send REQUEST_STK_SEND_ENVELOPE_COMMAND to ICC.
    *
    * @param tag
@@ -2724,16 +2731,21 @@ let RIL = {
         GsmPDUHelper.writeHexOctet(options.timerId);
     }
 
     // Timer Value
     if (options.timerValue != null) {
         ComprehensionTlvHelper.writeTimerValueTlv(options.timerValue, true);
     }
 
+    // Language
+    if (options.language) {
+      ComprehensionTlvHelper.writeLanguageTlv(options.language);
+    }
+
     // Calculate and write BER length to 2nd mark
     Buf.stopCalOutgoingSize();
 
     // Calculate and write Parcel size to 1st mark
     Buf.stopCalOutgoingSize();
 
     Buf.writeUint32(0);
     Buf.sendParcel();