diff --git a/homeassistant/components/netgear_lte/__init__.py b/homeassistant/components/netgear_lte/__init__.py
index 730c3851a2d..18a9e5e7c9d 100644
--- a/homeassistant/components/netgear_lte/__init__.py
+++ b/homeassistant/components/netgear_lte/__init__.py
@@ -62,19 +62,14 @@ class ModemData:
     host = attr.ib()
     modem = attr.ib()
 
-    serial_number = attr.ib(init=False, default=None)
-    unread_count = attr.ib(init=False, default=None)
-    usage = attr.ib(init=False, default=None)
+    data = attr.ib(init=False, default=None)
     connected = attr.ib(init=False, default=True)
 
     async def async_update(self):
         """Call the API to update the data."""
         import eternalegypt
         try:
-            information = await self.modem.information()
-            self.serial_number = information.serial_number
-            self.unread_count = sum(1 for x in information.sms if x.unread)
-            self.usage = information.usage
+            self.data = await self.modem.information()
             if not self.connected:
                 _LOGGER.warning("Connected to %s", self.host)
                 self.connected = True
@@ -82,8 +77,7 @@ class ModemData:
             if self.connected:
                 _LOGGER.warning("Lost connection to %s", self.host)
                 self.connected = False
-            self.unread_count = None
-            self.usage = None
+            self.data = None
 
         async_dispatcher_send(self.hass, DISPATCHER_NETGEAR_LTE)
 
diff --git a/homeassistant/components/netgear_lte/sensor.py b/homeassistant/components/netgear_lte/sensor.py
index a13f5fbfaa7..1be960edfe3 100644
--- a/homeassistant/components/netgear_lte/sensor.py
+++ b/homeassistant/components/netgear_lte/sensor.py
@@ -24,7 +24,7 @@ async def async_setup_platform(
 
     modem_data = hass.data[DATA_KEY].get_modem_data(discovery_info)
 
-    if not modem_data:
+    if not modem_data or not modem_data.data:
         raise PlatformNotReady
 
     sensor_conf = discovery_info[DOMAIN]
@@ -47,6 +47,14 @@ class LTESensor(Entity):
     modem_data = attr.ib()
     sensor_type = attr.ib()
 
+    _unique_id = attr.ib(init=False)
+
+    @_unique_id.default
+    def _init_unique_id(self):
+        """Register unique_id while we know data is valid."""
+        return "{}_{}".format(
+            self.sensor_type, self.modem_data.data.serial_number)
+
     async def async_added_to_hass(self):
         """Register callback."""
         async_dispatcher_connect(
@@ -61,10 +69,15 @@ class LTESensor(Entity):
         """Return that the sensor should not be polled."""
         return False
 
+    @property
+    def available(self):
+        """Return the availability of the sensor."""
+        return self.modem_data.data is not None
+
     @property
     def unique_id(self):
         """Return a unique ID like 'usage_5TG365AB0078V'."""
-        return "{}_{}".format(self.sensor_type, self.modem_data.serial_number)
+        return self._unique_id
 
 
 class SMSSensor(LTESensor):
@@ -78,7 +91,7 @@ class SMSSensor(LTESensor):
     @property
     def state(self):
         """Return the state of the sensor."""
-        return self.modem_data.unread_count
+        return sum(1 for x in self.modem_data.data.sms if x.unread)
 
 
 class UsageSensor(LTESensor):
@@ -97,7 +110,4 @@ class UsageSensor(LTESensor):
     @property
     def state(self):
         """Return the state of the sensor."""
-        if self.modem_data.usage is None:
-            return None
-
-        return round(self.modem_data.usage / 1024**2, 1)
+        return round(self.modem_data.data.usage / 1024**2, 1)