diff --git a/homeassistant/components/ios/__init__.py b/homeassistant/components/ios/__init__.py
index bc5c5ec1c4e..2feafba949d 100644
--- a/homeassistant/components/ios/__init__.py
+++ b/homeassistant/components/ios/__init__.py
@@ -9,6 +9,7 @@ from homeassistant.const import HTTP_BAD_REQUEST, HTTP_INTERNAL_SERVER_ERROR
 from homeassistant.core import callback
 from homeassistant.exceptions import HomeAssistantError
 from homeassistant.helpers import config_validation as cv, discovery
+from homeassistant.helpers.dispatcher import async_dispatcher_send
 from homeassistant.util.json import load_json, save_json
 
 from .const import (
@@ -346,9 +347,11 @@ class iOSIdentifyDeviceView(HomeAssistantView):
 
         data[ATTR_LAST_SEEN_AT] = datetime.datetime.now().isoformat()
 
-        name = data.get(ATTR_DEVICE_ID)
+        device_id = data[ATTR_DEVICE_ID]
 
-        hass.data[DOMAIN][ATTR_DEVICES][name] = data
+        hass.data[DOMAIN][ATTR_DEVICES][device_id] = data
+
+        async_dispatcher_send(hass, f"{DOMAIN}.{device_id}", data)
 
         try:
             save_json(self._config_path, hass.data[DOMAIN])
diff --git a/homeassistant/components/ios/sensor.py b/homeassistant/components/ios/sensor.py
index 01520063ccb..ccbc118a681 100644
--- a/homeassistant/components/ios/sensor.py
+++ b/homeassistant/components/ios/sensor.py
@@ -1,9 +1,13 @@
 """Support for Home Assistant iOS app sensors."""
 from homeassistant.components import ios
 from homeassistant.const import PERCENTAGE
+from homeassistant.core import callback
+from homeassistant.helpers.dispatcher import async_dispatcher_connect
 from homeassistant.helpers.entity import Entity
 from homeassistant.helpers.icon import icon_for_battery_level
 
+from .const import DOMAIN
+
 SENSOR_TYPES = {
     "level": ["Battery Level", PERCENTAGE],
     "state": ["Battery State", None],
@@ -73,6 +77,11 @@ class IOSSensor(Entity):
         device_id = self._device[ios.ATTR_DEVICE_ID]
         return f"{self.type}_{device_id}"
 
+    @property
+    def should_poll(self):
+        """No polling needed."""
+        return False
+
     @property
     def unit_of_measurement(self):
         """Return the unit of measurement this sensor expresses itself in."""
@@ -114,7 +123,17 @@ class IOSSensor(Entity):
             return icon_state
         return icon_for_battery_level(battery_level=battery_level, charging=charging)
 
-    async def async_update(self):
+    @callback
+    def _update(self, device):
         """Get the latest state of the sensor."""
-        self._device = ios.devices(self.hass).get(self._device_name)
+        self._device = device
         self._state = self._device[ios.ATTR_BATTERY][self.type]
+        self.async_write_ha_state()
+
+    async def async_added_to_hass(self) -> None:
+        """Added to hass so need to register to dispatch."""
+        self._state = self._device[ios.ATTR_BATTERY][self.type]
+        device_id = self._device[ios.ATTR_DEVICE_ID]
+        self.async_on_remove(
+            async_dispatcher_connect(self.hass, f"{DOMAIN}.{device_id}", self._update)
+        )