diff --git a/android/app/src/main/java/com/chatman/activity/ChatRoomActivity.java b/android/app/src/main/java/com/chatman/activity/ChatRoomActivity.java
index 21400eb03f7cc7092594e64ea82ea9fc11fb31f3..13a4ee465a879dac3d8e63f6ed1bf00275dc6ddc 100644
--- a/android/app/src/main/java/com/chatman/activity/ChatRoomActivity.java
+++ b/android/app/src/main/java/com/chatman/activity/ChatRoomActivity.java
@@ -189,7 +189,7 @@ public class ChatRoomActivity extends AppCompatActivity {
     public void onResume() {
         super.onResume();
         mSensorHelper.listenSensor(Sensor.TYPE_PROXIMITY);
-        mSensorHelper.listenSensor(Sensor.TYPE_GYROSCOPE);
+        mSensorHelper.listenSensor(Sensor.TYPE_ACCELEROMETER);
     }
 
     @Override
diff --git a/android/app/src/main/java/com/chatman/activity/MainActivity.java b/android/app/src/main/java/com/chatman/activity/MainActivity.java
index 5ccc1652ef1d425bb14d7ee8063526e5c078f9ef..7ec50ab0973b91f6049a2788b1d97d3761f1c496 100644
--- a/android/app/src/main/java/com/chatman/activity/MainActivity.java
+++ b/android/app/src/main/java/com/chatman/activity/MainActivity.java
@@ -127,7 +127,7 @@ public class MainActivity extends AppCompatActivity implements
     public void onResume() {
         super.onResume();
         mSensorHelper.listenSensor(Sensor.TYPE_PROXIMITY);
-        mSensorHelper.listenSensor(Sensor.TYPE_GYROSCOPE);
+        mSensorHelper.listenSensor(Sensor.TYPE_ACCELEROMETER);
     }
 
     @Override
diff --git a/android/app/src/main/java/com/chatman/helper/SensorHelper.java b/android/app/src/main/java/com/chatman/helper/SensorHelper.java
index 6f77e578f68fa87cee7b1305960946ecea3929d3..017c79d681a75c5bdb9ea2a9ed793b04c09738cd 100644
--- a/android/app/src/main/java/com/chatman/helper/SensorHelper.java
+++ b/android/app/src/main/java/com/chatman/helper/SensorHelper.java
@@ -46,8 +46,12 @@ public class SensorHelper {
                         Toast.makeText(context, "You are too close to device", Toast.LENGTH_SHORT).show();
                     }
                 }
-                else if (event.sensor.getType() == Sensor.TYPE_GYROSCOPE) {
-                    //gyro
+                else if (event.sensor.getType() == Sensor.TYPE_ACCELEROMETER) {
+                    //accelero
+                    float z = event.values[2];
+                    if (z > -10 && z < -8) {
+                        Toast.makeText(context, "Please don't use phone while resting down", Toast.LENGTH_SHORT).show();
+                    }
                 }
             }
         };