diff --git a/src/com/android/settings/wifi/CellularFallbackPreferenceController.java b/src/com/android/settings/wifi/CellularFallbackPreferenceController.java
index c411abaa3b1..659ddbe96bd 100644
--- a/src/com/android/settings/wifi/CellularFallbackPreferenceController.java
+++ b/src/com/android/settings/wifi/CellularFallbackPreferenceController.java
@@ -19,7 +19,6 @@ package com.android.settings.wifi;
 import android.content.Context;
 import android.content.res.Resources;
 import android.provider.Settings;
-import android.telephony.SubscriptionInfo;
 import android.telephony.SubscriptionManager;
 
 import com.android.internal.annotations.VisibleForTesting;
@@ -37,7 +36,7 @@ public class CellularFallbackPreferenceController extends TogglePreferenceContro
 
     @Override
     public int getAvailabilityStatus() {
-        return !avoidBadWifiConfig() ? AVAILABLE : UNSUPPORTED_ON_DEVICE;
+        return avoidBadWifiConfig() ? UNSUPPORTED_ON_DEVICE : AVAILABLE;
     }
 
     @Override
@@ -53,20 +52,18 @@ public class CellularFallbackPreferenceController extends TogglePreferenceContro
     }
 
     private boolean avoidBadWifiConfig() {
-        boolean avoidBadWifiConfig = true;
-        final SubscriptionManager subscriptionManager =
-                mContext.getSystemService(SubscriptionManager.class);
-
-        for (SubscriptionInfo subscriptionInfo :
-                subscriptionManager.getActiveSubscriptionInfoList()) {
-            final Resources resources = getResourcesForSubId(subscriptionInfo.getSubscriptionId());
-            if (resources.getInteger(
-                    com.android.internal.R.integer.config_networkAvoidBadWifi) == 0) {
-                avoidBadWifiConfig = false;
-                break;
-            }
+        final int activeDataSubscriptionId = getActiveDataSubscriptionId();
+        if (activeDataSubscriptionId == SubscriptionManager.INVALID_SUBSCRIPTION_ID) {
+            return true;
         }
-        return avoidBadWifiConfig;
+
+        final Resources resources = getResourcesForSubId(activeDataSubscriptionId);
+        return resources.getInteger(com.android.internal.R.integer.config_networkAvoidBadWifi) == 1;
+    }
+
+    @VisibleForTesting
+    int getActiveDataSubscriptionId() {
+        return SubscriptionManager.getActiveDataSubscriptionId();
     }
 
     @VisibleForTesting
diff --git a/tests/robotests/src/com/android/settings/wifi/CellularFallbackPreferenceControllerTest.java b/tests/robotests/src/com/android/settings/wifi/CellularFallbackPreferenceControllerTest.java
index e5d5d8fda77..6f3230cff4f 100644
--- a/tests/robotests/src/com/android/settings/wifi/CellularFallbackPreferenceControllerTest.java
+++ b/tests/robotests/src/com/android/settings/wifi/CellularFallbackPreferenceControllerTest.java
@@ -26,12 +26,8 @@ import static org.mockito.Mockito.when;
 
 import android.content.Context;
 import android.content.res.Resources;
-import android.telephony.SubscriptionInfo;
 import android.telephony.SubscriptionManager;
 
-import java.util.ArrayList;
-import java.util.List;
-
 import org.junit.Before;
 import org.junit.Test;
 import org.junit.runner.RunWith;
@@ -39,32 +35,35 @@ import org.mockito.Mock;
 import org.mockito.MockitoAnnotations;
 import org.robolectric.RobolectricTestRunner;
 import org.robolectric.RuntimeEnvironment;
-import org.robolectric.shadows.ShadowApplication;
 
 @RunWith(RobolectricTestRunner.class)
 public class CellularFallbackPreferenceControllerTest {
     private static final String KEY_CELLULAR_FALLBACK = "wifi_cellular_data_fallback";
 
-    @Mock
-    private SubscriptionManager mSubscriptionManager;
-
     private CellularFallbackPreferenceController mController;
 
     @Before
     public void setUp() {
         MockitoAnnotations.initMocks(this);
-        ShadowApplication shadowApplication = ShadowApplication.getInstance();
-        shadowApplication.setSystemService(Context.TELEPHONY_SUBSCRIPTION_SERVICE,
-                mSubscriptionManager);
+
         mController = spy(new CellularFallbackPreferenceController(RuntimeEnvironment.application,
                 KEY_CELLULAR_FALLBACK));
     }
 
+    @Test
+    public void isAvailable_invalidActiveSubscriptionId_shouldReturnFalse() {
+        doReturn(SubscriptionManager.INVALID_SUBSCRIPTION_ID)
+                .when(mController).getActiveDataSubscriptionId();
+
+        assertThat(mController.isAvailable()).isFalse();
+    }
+
     @Test
     public void isAvailable_avoidBadWifiConfigIsFalse_shouldReturnTrue() {
-        setupMockIcc();
         final Resources resources = mock(Resources.class);
 
+        doReturn(SubscriptionManager.DEFAULT_SUBSCRIPTION_ID)
+                .when(mController).getActiveDataSubscriptionId();
         doReturn(resources).when(mController).getResourcesForSubId(anyInt());
         when(resources.getInteger(
                 com.android.internal.R.integer.config_networkAvoidBadWifi))
@@ -75,9 +74,10 @@ public class CellularFallbackPreferenceControllerTest {
 
     @Test
     public void isAvailable_avoidBadWifiConfigIsTrue_shouldReturnFalse() {
-        setupMockIcc();
         final Resources resources = mock(Resources.class);
 
+        doReturn(SubscriptionManager.DEFAULT_SUBSCRIPTION_ID)
+                .when(mController).getActiveDataSubscriptionId();
         doReturn(resources).when(mController).getResourcesForSubId(anyInt());
         when(resources.getInteger(
                 com.android.internal.R.integer.config_networkAvoidBadWifi))
@@ -85,14 +85,4 @@ public class CellularFallbackPreferenceControllerTest {
 
         assertThat(mController.isAvailable()).isFalse();
     }
-
-    private void setupMockIcc() {
-        final List<SubscriptionInfo> subscriptionInfoList = new ArrayList<>();
-        final SubscriptionInfo info1 = mock(SubscriptionInfo.class);
-        final SubscriptionInfo info2 = mock(SubscriptionInfo.class);
-        subscriptionInfoList.add(info1);
-        subscriptionInfoList.add(info2);
-        when(mSubscriptionManager.getActiveSubscriptionInfoList())
-                .thenReturn(subscriptionInfoList);
-    }
-}
+}
\ No newline at end of file