diff --git a/services/findmyiphone.py b/services/findmyiphone.py
old mode 100644
new mode 100755
index 3be69ff..72155b6
--- a/services/findmyiphone.py
+++ b/services/findmyiphone.py
@@ -15,6 +15,7 @@ class FindMyiPhoneService(object):
         self._fmip_endpoint = '%s/fmipservice/client/web' % self._service_root
         self._fmip_refresh_url = '%s/refreshClient' % self._fmip_endpoint
         self._fmip_sound_url = '%s/playSound' % self._fmip_endpoint
+        self._fmip_lost_url = '%s/lostDevice' % self._fmip_endpoint
 
     def refresh_client(self):
         """
@@ -58,3 +59,23 @@ class FindMyiPhoneService(object):
         self.refresh_client()
         data = json.dumps({'device': self.content['id'], 'subject': subject})
         self.session.post(self._fmip_sound_url, params=self.params, data=data)
+
+    def lost_device(self, number, text=None):
+        """
+        Send a request to the device to trigger 'lost mode'. The
+        device will show the message in `text`, and if a number has
+        been passed, then the person holding the device can call
+        the number without entering the passcode.
+        """
+        self.refresh_client()
+        if not text:
+            text = 'This iPhone has been lost. Please call me.'
+        data = json.dumps({
+            'text': text,
+            'userText': True,
+            'ownerNbr': number,
+            'lostModeEnabled': True,
+            'trackingEnabled': True,
+            'device': self.content['id'],
+        })
+        self.session.post(self._fmip_lost_url, params=self.params, data=data)