Disable Mobile settings in one condition.

If there is no active subscription and esim is unsupported, disable
this preference.

Bug: 129143739
Test: RunSettingsRoboTests
Change-Id: I5f8b0d95df8764a3a505aae5e26df42e9412c021

src/com/android/settings/network/MobileNetworkSummaryController.java

@@ -137,6 +137,8 @@ public class MobileNetworkSummaryController extends AbstractPreferenceController
                     startAddSimFlow();
                     return true;
                 });
+            } else {
+                mPreference.setEnabled(false);
             }
         } else {
             // We have one or more existing subscriptions, so we want the plus button if eSIM is

tests/robotests/src/com/android/settings/network/MobileNetworkSummaryControllerTest.java

@@ -282,6 +282,18 @@ public class MobileNetworkSummaryControllerTest {
         assertThat(captor.getValue()).isFalse();
     }
 
+    @Test
+    public void onResume_noSubscriptionEsimDisabled_isDisabled() {
+        Settings.Global.putInt(mContext.getContentResolver(), Settings.Global.AIRPLANE_MODE_ON, 0);
+        SubscriptionUtil.setAvailableSubscriptionsForTesting(null);
+        when(mEuiccManager.isEnabled()).thenReturn(false);
+        mController.displayPreference(mPreferenceScreen);
+
+        mController.onResume();
+
+        assertThat(mPreference.isEnabled()).isFalse();
+    }
+
     @Test
     public void onAirplaneModeChanged_oneSubscriptionAirplaneModeGetsTurnedOn_isDisabled() {
         final SubscriptionInfo sub1 = mock(SubscriptionInfo.class);