diff --git a/java/google/registry/ui/server/registrar/RegistrarSettingsAction.java b/java/google/registry/ui/server/registrar/RegistrarSettingsAction.java
index b5105945f..5f311ce52 100644
--- a/java/google/registry/ui/server/registrar/RegistrarSettingsAction.java
+++ b/java/google/registry/ui/server/registrar/RegistrarSettingsAction.java
@@ -35,6 +35,7 @@ import google.registry.config.RegistryConfig.Config;
 import google.registry.export.sheet.SyncRegistrarsSheetAction;
 import google.registry.model.registrar.Registrar;
 import google.registry.model.registrar.RegistrarContact;
+import google.registry.model.registrar.RegistrarContact.Type;
 import google.registry.request.Action;
 import google.registry.request.HttpException.BadRequestException;
 import google.registry.request.JsonActionRunner;
@@ -268,12 +269,25 @@ public class RegistrarSettingsAction implements Runnable, JsonActionRunner.JsonA
         throw new ContactRequirementException(t);
       }
     }
-    // Ensure at least one tech contact has a phone number if one was present before.
-    if (any(oldContactsByType.get(RegistrarContact.Type.TECH), HAS_PHONE)
-        && !any(newContactsByType.get(RegistrarContact.Type.TECH), HAS_PHONE)) {
-      throw new ContactRequirementException(String.format(
-          "At least one %s contact must have a phone number",
-          RegistrarContact.Type.TECH.getDisplayName()));
+    ensurePhoneNumberNotRemovedForContactTypes(
+        oldContactsByType, newContactsByType, Type.ABUSE, Type.TECH);
+  }
+
+  /**
+   * Ensure that for each given registrar type, a phone number is present after update, if there 
+   * was one before.
+   */
+  private static void ensurePhoneNumberNotRemovedForContactTypes(
+      Multimap<RegistrarContact.Type, RegistrarContact> oldContactsByType,
+      Multimap<RegistrarContact.Type, RegistrarContact> newContactsByType,
+      RegistrarContact.Type... types) {
+    for (RegistrarContact.Type type : types) {
+      if (any(oldContactsByType.get(type), HAS_PHONE)
+          && !any(newContactsByType.get(type), HAS_PHONE)) {
+        throw new ContactRequirementException(
+            String.format(
+                "At least one %s contact must have a phone number", type.getDisplayName()));
+      }
     }
   }
 
diff --git a/javatests/google/registry/ui/server/registrar/ContactSettingsTest.java b/javatests/google/registry/ui/server/registrar/ContactSettingsTest.java
index e4d81fc7b..839892243 100644
--- a/javatests/google/registry/ui/server/registrar/ContactSettingsTest.java
+++ b/javatests/google/registry/ui/server/registrar/ContactSettingsTest.java
@@ -128,4 +128,28 @@ public class ContactSettingsTest extends RegistrarSettingsActionTestCase {
     assertThat(response).containsEntry("message", "At least one "
         + RegistrarContact.Type.TECH.getDisplayName() + " contact must have a phone number");
   }
+
+  @Test
+  public void testPost_updateContacts_requireAbusePhone_error() throws Exception {
+    // First make the contact a abuse contact as well.
+    Registrar registrar = Registrar.loadByClientId(CLIENT_ID);
+    RegistrarContact rc = AppEngineRule.makeRegistrarContact2()
+        .asBuilder()
+        .setTypes(ImmutableSet.of(RegistrarContact.Type.ADMIN, RegistrarContact.Type.ABUSE))
+        .build();
+    // Lest we anger the timestamp inversion bug.
+    persistResource(registrar);
+    persistSimpleResource(rc);
+
+    // Now try to remove the phone number.
+    rc = rc.asBuilder().setPhoneNumber(null).build();
+    Map<String, Object> reqJson = registrar.toJsonMap();
+    reqJson.put("contacts", ImmutableList.of(rc.toJsonMap()));
+    Map<String, Object> response = action.handleJsonRequest(ImmutableMap.of(
+        "op", "update",
+        "args", reqJson));
+    assertThat(response).containsEntry("status", "ERROR");
+    assertThat(response).containsEntry("message", "At least one "
+        + RegistrarContact.Type.ABUSE.getDisplayName() + " contact must have a phone number");
+  }
 }