Hide "Phone number" from About page if not call enabled.

Bug: None
Test: make RunSettingsRoboTests
ROBOTEST_FILTER=com.android.settings.deviceinfo
Change-Id: Ib056bae12d23fe68e71fe78c92741b8dc7887de0

src/com/android/settings/deviceinfo/PhoneNumberPreferenceController.java

@@ -58,7 +58,7 @@ public class PhoneNumberPreferenceController extends AbstractPreferenceControlle
 
     @Override
     public boolean isAvailable() {
-        return true;
+        return mTelephonyManager.isVoiceCapable();
     }
 
     @Override

tests/robotests/src/com/android/settings/deviceinfo/PhoneNumberPreferenceControllerTest.java

@@ -16,6 +16,9 @@
 
 package com.android.settings.deviceinfo;
 
+import static junit.framework.Assert.assertFalse;
+import static junit.framework.Assert.assertTrue;
+
 import static org.mockito.ArgumentMatchers.anyInt;
 import static org.mockito.Mockito.doReturn;
 import static org.mockito.Mockito.spy;
@@ -73,6 +76,20 @@ public class PhoneNumberPreferenceControllerTest {
         when(mPreference.isVisible()).thenReturn(true);
     }
 
+    @Test
+    public void isAvailable_shouldBeTrueIfCallCapable() {
+        when(mTelephonyManager.isVoiceCapable()).thenReturn(true);
+
+        assertTrue(mController.isAvailable());
+    }
+
+    @Test
+    public void isAvailable_shouldBeFalseIfNotCallCapable() {
+        when(mTelephonyManager.isVoiceCapable()).thenReturn(false);
+
+        assertFalse(mController.isAvailable());
+    }
+
     @Test
     public void displayPreference_multiSim_shouldAddSecondPreference() {
         when(mTelephonyManager.getPhoneCount()).thenReturn(2);