I have developed a service which includes timer task and runs after every 5 minutes for keeping tracking record of the device, every five minutes it adds a record to the database. My service is working fine when the phone is not moving i.e it gives records after every 5 minutes as it should be. But i have noticed that when the phone is on move it updates the points after 10 or 20 minutes , i.e whenever the user stops in his way whenever he is on the move. Do service freezes on the move, if yes! how is whatsapp messenger managing it?? Please help! i am writing my onstart method. please help @Override public void onStart(Intent intent, int startId) { Toast.makeText(this, "My Service Started", Toast.LENGTH_LONG).show(); Log.d(TAG, "onStart"); mLocationClient.connect(); final Handler handler_service = new Handler(); timer_service = new Timer(); TimerTask thread_service = new TimerTask() { @Override public void run() { handler_service.post(new Runnable() { @Override public void run() { try { some function of tracking } }); } }; timer_service.schedule(thread_service, 1000, service_timing); //sync thread final Handler handler_sync = new Handler(); timer_sync = new Timer(); TimerTask thread_sync = new TimerTask() { @Override public void run() { handler_sync.post(new Runnable() { @Override public void run() { try { //connecting to the central server for updation Connect(); } catch (Exception e) { // TODO Auto-generated catch block } } }); } }; timer_sync.schedule(thread_sync,2000, sync_timing); }