diff --git a/app/src/main/java/org/traccar/client/MainActivity.java b/app/src/main/java/org/traccar/client/MainActivity.java
index 955cb44..9f61229 100644
--- a/app/src/main/java/org/traccar/client/MainActivity.java
+++ b/app/src/main/java/org/traccar/client/MainActivity.java
@@ -51,11 +51,6 @@ public class MainActivity extends PreferenceActivity implements OnSharedPreferen
         addPreferencesFromResource(R.xml.preferences);
         initPreferences();
 
-        // DELME
-        if (PreferenceManager.getDefaultSharedPreferences(this).getString(KEY_PROVIDER, null).equals("mixed")) {
-            PreferenceManager.getDefaultSharedPreferences(this).edit().putString(KEY_PROVIDER, LocationManager.GPS_PROVIDER).commit();
-        }
-
         if (getPreferenceScreen().getSharedPreferences().getBoolean(KEY_STATUS, false)) {
             setPreferencesEnabled(false);
             startService(new Intent(this, TrackingService.class));
diff --git a/app/src/main/java/org/traccar/client/MixedPositionProvider.java b/app/src/main/java/org/traccar/client/MixedPositionProvider.java
new file mode 100644
index 0000000..298750a
--- /dev/null
+++ b/app/src/main/java/org/traccar/client/MixedPositionProvider.java
@@ -0,0 +1,117 @@
+/*
+ * Copyright 2015 Anton Tananaev (anton.tananaev@gmail.com)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.traccar.client;
+
+import android.content.Context;
+import android.location.GpsStatus;
+import android.location.Location;
+import android.location.LocationListener;
+import android.location.LocationManager;
+import android.os.Bundle;
+import android.util.Log;
+
+public class MixedPositionProvider extends PositionProvider implements LocationListener, GpsStatus.Listener {
+
+    private static int FIX_TIMEOUT = 30 * 1000;
+
+    private LocationListener backupListener;
+    private long lastFixTime;
+
+    public MixedPositionProvider(Context context, PositionListener listener) {
+        super(context, listener);
+    }
+
+    public void startUpdates() {
+        lastFixTime = System.currentTimeMillis();
+        locationManager.addGpsStatusListener(this);
+        locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, period, 0, this);
+    }
+
+    public void stopUpdates() {
+        locationManager.removeUpdates(this);
+        locationManager.removeGpsStatusListener(this);
+        stopBackupProvider();
+    }
+
+    private void startBackupProvider() {
+        Log.i(TAG, "backup provider start");
+        if (backupListener == null) {
+
+            backupListener = new LocationListener() {
+                @Override
+                public void onLocationChanged(Location location) {
+                    Log.i(TAG, "backup provider location");
+                    updateLocation(location);
+                }
+
+                @Override
+                public void onStatusChanged(String s, int i, Bundle bundle) {
+                }
+
+                @Override
+                public void onProviderEnabled(String s) {
+                }
+
+                @Override
+                public void onProviderDisabled(String s) {
+                }
+            };
+
+            locationManager.requestLocationUpdates(
+                    LocationManager.NETWORK_PROVIDER, period, 0, backupListener);
+        }
+    }
+
+    private void stopBackupProvider() {
+        Log.i(TAG, "backup provider stop");
+        if (backupListener != null) {
+            locationManager.removeUpdates(backupListener);
+            backupListener = null;
+        }
+    }
+
+    @Override
+    public void onLocationChanged(Location location) {
+        Log.i(TAG, "provider location");
+        stopBackupProvider();
+        lastFixTime = System.currentTimeMillis();
+        updateLocation(location);
+    }
+
+    @Override
+    public void onStatusChanged(String provider, int status, Bundle extras) {
+    }
+
+    @Override
+    public void onProviderEnabled(String provider) {
+        Log.i(TAG, "provider enabled");
+        stopBackupProvider();
+    }
+
+    @Override
+    public void onProviderDisabled(String provider) {
+        Log.i(TAG, "provider disabled");
+        startBackupProvider();
+    }
+
+    @Override
+    public void onGpsStatusChanged(int event) {
+        if (backupListener == null && System.currentTimeMillis() - (lastFixTime + period) > FIX_TIMEOUT) {
+            startBackupProvider();
+        }
+    }
+
+}
diff --git a/app/src/main/java/org/traccar/client/PositionProvider.java b/app/src/main/java/org/traccar/client/PositionProvider.java
index 43d7611..d0ae8a8 100644
--- a/app/src/main/java/org/traccar/client/PositionProvider.java
+++ b/app/src/main/java/org/traccar/client/PositionProvider.java
@@ -21,17 +21,15 @@ import android.content.Intent;
 import android.content.IntentFilter;
 import android.content.SharedPreferences;
 import android.location.Location;
-import android.location.LocationListener;
 import android.location.LocationManager;
 import android.os.BatteryManager;
 import android.os.Build;
-import android.os.Bundle;
 import android.preference.PreferenceManager;
 import android.util.Log;
 
-public class PositionProvider implements LocationListener {
+public abstract class PositionProvider {
 
-    private static final String TAG = PositionProvider.class.getSimpleName();
+    protected static final String TAG = PositionProvider.class.getSimpleName();
 
     public interface PositionListener {
         void onPositionUpdate(Position position);
@@ -41,11 +39,13 @@ public class PositionProvider implements LocationListener {
 
     private final Context context;
     private final SharedPreferences preferences;
-    private final LocationManager locationManager;
+    protected final LocationManager locationManager;
 
     private String deviceId;
-    private String type;
-    private final long period;
+    protected String type;
+    protected final long period;
+
+    private long lastUpdateTime;
 
     public PositionProvider(Context context, PositionListener listener) {
         this.context = context;
@@ -58,49 +58,24 @@ public class PositionProvider implements LocationListener {
         period = Integer.parseInt(preferences.getString(MainActivity.KEY_INTERVAL, null)) * 1000;
 
         type = preferences.getString(MainActivity.KEY_PROVIDER, null);
-        if (!type.equals(LocationManager.NETWORK_PROVIDER)) {
-            type = LocationManager.GPS_PROVIDER;
-        }
     }
 
-    public void startUpdates() {
-        locationManager.requestLocationUpdates(type, period, 0, this);
-    }
+    public abstract void startUpdates();
 
-    public void stopUpdates() {
-        locationManager.removeUpdates(this);
-    }
+    public abstract void stopUpdates();
 
-    private long lastTime;
-
-    @Override
-    public void onLocationChanged(Location location) {
-        if (location != null && location.getTime() != lastTime) {
+    protected void updateLocation(Location location) {
+        if (location != null && location.getTime() != lastUpdateTime) {
             Log.i(TAG, "location new");
-            lastTime = location.getTime();
+            lastUpdateTime = location.getTime();
             listener.onPositionUpdate(new Position(deviceId, location, getBatteryLevel()));
         } else {
             Log.i(TAG, location != null ? "location old" : "location nil");
         }
     }
 
-    @Override
-    public void onStatusChanged(String provider, int status, Bundle extras) {
-        Log.i(TAG, "provider status");
-    }
-
-    @Override
-    public void onProviderEnabled(String provider) {
-        Log.i(TAG, "provider enabled");
-    }
-
-    @Override
-    public void onProviderDisabled(String provider) {
-        Log.i(TAG, "provider disabled");
-    }
-
     @TargetApi(Build.VERSION_CODES.ECLAIR)
-    public double getBatteryLevel() {
+    private double getBatteryLevel() {
         if (android.os.Build.VERSION.SDK_INT > Build.VERSION_CODES.ECLAIR) {
             Intent batteryIntent = context.registerReceiver(null, new IntentFilter(Intent.ACTION_BATTERY_CHANGED));
             int level = batteryIntent.getIntExtra(BatteryManager.EXTRA_LEVEL, 0);
diff --git a/app/src/main/java/org/traccar/client/SimplePositionProvider.java b/app/src/main/java/org/traccar/client/SimplePositionProvider.java
new file mode 100644
index 0000000..1dd7dfd
--- /dev/null
+++ b/app/src/main/java/org/traccar/client/SimplePositionProvider.java
@@ -0,0 +1,58 @@
+/*
+ * Copyright 2015 Anton Tananaev (anton.tananaev@gmail.com)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.traccar.client;
+
+import android.content.Context;
+import android.location.Location;
+import android.location.LocationListener;
+import android.location.LocationManager;
+import android.os.Bundle;
+
+public class SimplePositionProvider extends PositionProvider implements LocationListener {
+
+    public SimplePositionProvider(Context context, PositionListener listener) {
+        super(context, listener);
+        if (!type.equals(LocationManager.NETWORK_PROVIDER)) {
+            type = LocationManager.GPS_PROVIDER;
+        }
+    }
+
+    public void startUpdates() {
+        locationManager.requestLocationUpdates(type, period, 0, this);
+    }
+
+    public void stopUpdates() {
+        locationManager.removeUpdates(this);
+    }
+
+    @Override
+    public void onLocationChanged(Location location) {
+        updateLocation(location);
+    }
+
+    @Override
+    public void onStatusChanged(String provider, int status, Bundle extras) {
+    }
+
+    @Override
+    public void onProviderEnabled(String provider) {
+    }
+
+    @Override
+    public void onProviderDisabled(String provider) {
+    }
+
+}
diff --git a/app/src/main/java/org/traccar/client/TrackingController.java b/app/src/main/java/org/traccar/client/TrackingController.java
index 09c0e7b..d9a8eb3 100644
--- a/app/src/main/java/org/traccar/client/TrackingController.java
+++ b/app/src/main/java/org/traccar/client/TrackingController.java
@@ -55,7 +55,11 @@ public class TrackingController implements PositionProvider.PositionListener, Ne
         this.context = context;
         handler = new Handler();
         preferences = PreferenceManager.getDefaultSharedPreferences(context);
-        positionProvider = new PositionProvider(context, this);
+        if (preferences.getString(MainActivity.KEY_PROVIDER, null).equals("mixed")) {
+            positionProvider = new MixedPositionProvider(context, this);
+        } else {
+            positionProvider = new SimplePositionProvider(context, this);
+        }
         databaseHelper = new DatabaseHelper(context);
         networkManager = new NetworkManager(context, this);
         isOnline = networkManager.isOnline();
diff --git a/app/src/main/res/values-cs/strings.xml b/app/src/main/res/values-cs/strings.xml
index 849d3b9..38d5e6f 100644
--- a/app/src/main/res/values-cs/strings.xml
+++ b/app/src/main/res/values-cs/strings.xml
@@ -21,6 +21,7 @@
     <string-array name="settings_provider_names">
         <item>GPS</item>
         <item>Mobilní síť</item>
+        <item>Obojí</item>
     </string-array>
     <string name="settings_foreground_title">Popředí služba</string>
     <string name="settings_foreground_summary">Zvýšit prioritu služba</string>
diff --git a/app/src/main/res/values-da/strings.xml b/app/src/main/res/values-da/strings.xml
index 3229f0c..25d285c 100644
--- a/app/src/main/res/values-da/strings.xml
+++ b/app/src/main/res/values-da/strings.xml
@@ -21,6 +21,7 @@
     <string-array name="settings_provider_names">
         <item>GPS udbyder</item>
         <item>Netværks udbyder</item>
+        <item>Mixet udbyder</item>
     </string-array>
     <string name="settings_foreground_title">Forgrunden tjeneste</string>
     <string name="settings_foreground_summary">Øg tjeneste prioritet</string>
diff --git a/app/src/main/res/values-de/strings.xml b/app/src/main/res/values-de/strings.xml
index baf25c3..dc2ea29 100644
--- a/app/src/main/res/values-de/strings.xml
+++ b/app/src/main/res/values-de/strings.xml
@@ -21,6 +21,7 @@
     <string-array name="settings_provider_names">
         <item>GPS</item>
         <item>Netzwerk</item>
+        <item>Gemischt</item>
     </string-array>
     <string name="settings_foreground_title">Vordergrund service</string>
     <string name="settings_foreground_summary">Erhöhen service priorität</string>
diff --git a/app/src/main/res/values-es/strings.xml b/app/src/main/res/values-es/strings.xml
index 22efd88..7af1ba9 100644
--- a/app/src/main/res/values-es/strings.xml
+++ b/app/src/main/res/values-es/strings.xml
@@ -21,6 +21,7 @@
     <string-array name="settings_provider_names">
         <item>Proveedor GPS</item>
         <item>Proveedor de red</item>
+        <item>Proveedor mixto</item>
 	</string-array>
     <string name="settings_foreground_title">Servicio de primer plano</string>
     <string name="settings_foreground_summary">Aumentar prioridad de servicio</string>
diff --git a/app/src/main/res/values-fr/strings.xml b/app/src/main/res/values-fr/strings.xml
index 446bc4e..9ff189d 100644
--- a/app/src/main/res/values-fr/strings.xml
+++ b/app/src/main/res/values-fr/strings.xml
@@ -21,6 +21,7 @@
     <string-array name="settings_provider_names">
         <item>Mode GPS uniquement</item>
         <item>Mode cellulaire uniquement</item>
+        <item>Mode hybride</item>
     </string-array>
     <string name="settings_foreground_title">Un service de premier plan</string>
     <string name="settings_foreground_summary">Augmenter la priorité de service</string>
diff --git a/app/src/main/res/values-nb/strings.xml b/app/src/main/res/values-nb/strings.xml
index 4ad525a..c3f18fd 100644
--- a/app/src/main/res/values-nb/strings.xml
+++ b/app/src/main/res/values-nb/strings.xml
@@ -21,6 +21,7 @@
     <string-array name="settings_provider_names">
         <item>GPS-lokalisering</item>
         <item>Nettverkslokalisering</item>
+        <item>Blandet lokalisering</item>
     </string-array>
     <string name="settings_foreground_title">Forgrunnen tjeneste</string>
     <string name="settings_foreground_summary">Øk tjeneste prioritet</string>
diff --git a/app/src/main/res/values-pt/strings.xml b/app/src/main/res/values-pt/strings.xml
index ae5ac09..c3df469 100644
--- a/app/src/main/res/values-pt/strings.xml
+++ b/app/src/main/res/values-pt/strings.xml
@@ -21,6 +21,7 @@
     <string-array name="settings_provider_names">
         <item>Provedor GPS</item>
         <item>Provedor Rede</item>
+        <item>Provedor Misto</item>
     </string-array>
     <string name="settings_foreground_title">Serviço primeiro plano</string>
     <string name="settings_foreground_summary">Aumentar a prioridade de serviço</string>
diff --git a/app/src/main/res/values-ru/strings.xml b/app/src/main/res/values-ru/strings.xml
index 5e6c9c5..6cb9e44 100644
--- a/app/src/main/res/values-ru/strings.xml
+++ b/app/src/main/res/values-ru/strings.xml
@@ -21,6 +21,7 @@
     <string-array name="settings_provider_names">
         <item>GPS провайдер</item>
         <item>Сетевой провайдер</item>
+        <item>Смешанный провайдер</item>
     </string-array>
     <string name="settings_foreground_title">Приоритетный сервис</string>
     <string name="settings_foreground_summary">Увеличить приоритет сервиса</string>
diff --git a/app/src/main/res/values-sr/strings.xml b/app/src/main/res/values-sr/strings.xml
index 6cbca3a..91eb6f7 100644
--- a/app/src/main/res/values-sr/strings.xml
+++ b/app/src/main/res/values-sr/strings.xml
@@ -21,9 +21,10 @@
     <string-array name="settings_provider_names">
         <item>GPS provajder</item>
         <item>Provajder Mreže</item>
+        <item>Oba zajedno provajdera</item>
     </string-array>
     <string name="settings_foreground_title">Prvi plan servis</string>
-        <string name="settings_foreground_summary">Povecanje usluga prioritet</string>
+    <string name="settings_foreground_summary">Povecanje usluga prioritet</string>
 
     <string name="menu_status">Status</string>
     <string name="menu_about">O klijentu</string>
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 98d2890..1f7e899 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -21,6 +21,7 @@
     <string-array name="settings_provider_names">
         <item>GPS provider</item>
         <item>Network provider</item>
+        <item>Mixed provider</item>
     </string-array>
     <string name="settings_foreground_title">Foreground service</string>
     <string name="settings_foreground_summary">Increase service priority</string>
diff --git a/app/src/main/res/values/values.xml b/app/src/main/res/values/values.xml
index 892f401..6a7ddb1 100644
--- a/app/src/main/res/values/values.xml
+++ b/app/src/main/res/values/values.xml
@@ -4,6 +4,7 @@
     <string-array name="settings_provider_values" translatable="false">
         <item>gps</item>
         <item>network</item>
+        <item>mixed</item>
     </string-array>
 
 </resources>