diff --git a/src/com/android/settings/deviceinfo/PhoneNumberPreferenceController.java b/src/com/android/settings/deviceinfo/PhoneNumberPreferenceController.java
index ddc3ad6643e..537c705d0bf 100644
--- a/src/com/android/settings/deviceinfo/PhoneNumberPreferenceController.java
+++ b/src/com/android/settings/deviceinfo/PhoneNumberPreferenceController.java
@@ -120,7 +120,7 @@ public class PhoneNumberPreferenceController extends BasePreferenceController {
     private CharSequence getFirstPhoneNumber() {
         final List<SubscriptionInfo> subscriptionInfoList =
                 mSubscriptionManager.getActiveSubscriptionInfoList(true);
-        if (subscriptionInfoList == null) {
+        if (subscriptionInfoList == null || subscriptionInfoList.isEmpty()) {
             return mContext.getText(R.string.device_info_default);
         }
 
diff --git a/tests/robotests/src/com/android/settings/deviceinfo/PhoneNumberPreferenceControllerTest.java b/tests/robotests/src/com/android/settings/deviceinfo/PhoneNumberPreferenceControllerTest.java
index 023135d4d7f..3e6e4360f37 100644
--- a/tests/robotests/src/com/android/settings/deviceinfo/PhoneNumberPreferenceControllerTest.java
+++ b/tests/robotests/src/com/android/settings/deviceinfo/PhoneNumberPreferenceControllerTest.java
@@ -149,6 +149,16 @@ public class PhoneNumberPreferenceControllerTest {
         assertThat(primaryNumber).isEqualTo(mContext.getString(R.string.device_info_default));
     }
 
+    @Test
+    public void getSummary_getEmptySubscriptionInfo_shouldShowUnknown() {
+        List<SubscriptionInfo> infos = new ArrayList<>();
+        when(mSubscriptionManager.getActiveSubscriptionInfoList(eq(true))).thenReturn(infos);
+
+        CharSequence primaryNumber = mController.getSummary();
+
+        assertThat(primaryNumber).isEqualTo(mContext.getString(R.string.device_info_default));
+    }
+
     @Test
     public void isSliceable_shouldBeTrue() {
         assertThat(mController.isSliceable()).isTrue();