diff --git a/packages/twenty-front/src/modules/settings/data-model/constants/SettingsCompositeFieldTypeConfigs.ts b/packages/twenty-front/src/modules/settings/data-model/constants/SettingsCompositeFieldTypeConfigs.ts
index 7cd02af8cca..9a20d83577c 100644
--- a/packages/twenty-front/src/modules/settings/data-model/constants/SettingsCompositeFieldTypeConfigs.ts
+++ b/packages/twenty-front/src/modules/settings/data-model/constants/SettingsCompositeFieldTypeConfigs.ts
@@ -209,7 +209,7 @@ export const SETTINGS_COMPOSITE_FIELD_TYPE_CONFIGS = {
             .primaryPhoneCallingCode,
         isImportable: true,
         isFilterable: true,
-        isIncludedInUniqueConstraint: false,
+        isIncludedInUniqueConstraint: true,
       },
       {
         subFieldName:
diff --git a/packages/twenty-server/src/engine/api/common/common-query-runners/common-create-many-query-runner/utils/__tests__/get-conflicting-fields.util.spec.ts b/packages/twenty-server/src/engine/api/common/common-query-runners/common-create-many-query-runner/utils/__tests__/get-conflicting-fields.util.spec.ts
index 9d72bc0e650..306f3b1f43a 100644
--- a/packages/twenty-server/src/engine/api/common/common-query-runners/common-create-many-query-runner/utils/__tests__/get-conflicting-fields.util.spec.ts
+++ b/packages/twenty-server/src/engine/api/common/common-query-runners/common-create-many-query-runner/utils/__tests__/get-conflicting-fields.util.spec.ts
@@ -61,6 +61,13 @@ describe('getConflictingFields', () => {
     isUnique: false,
   });
 
+  const phonesUniqueField = createMockField({
+    id: 'phones-unique-id',
+    name: 'phonesField',
+    type: FieldMetadataType.PHONES,
+    isUnique: true,
+  });
+
   const addressUniqueFieldNoIncludedProp = createMockField({
     id: 'address-unique-id',
     name: 'addressField',
@@ -170,6 +177,33 @@ describe('getConflictingFields', () => {
     expect(result).toEqual([{ baseField: 'id', fullPath: 'id', column: 'id' }]);
   });
 
+  it('returns all unique constraint subfields for composite fields with multiple included properties', () => {
+    const fields = [idField, phonesUniqueField];
+    const flatObjectMetadata = buildFlatObjectMetadata(fields);
+    const flatFieldMetadataMaps = buildFlatFieldMetadataMaps(fields);
+
+    const result = getConflictingFields(
+      flatObjectMetadata,
+      flatFieldMetadataMaps,
+    );
+
+    expect(result).toEqual(
+      expect.arrayContaining([
+        { baseField: 'id', fullPath: 'id', column: 'id' },
+        {
+          baseField: 'phonesField',
+          fullPath: 'phonesField.primaryPhoneNumber',
+          column: 'phonesFieldPrimaryPhoneNumber',
+        },
+        {
+          baseField: 'phonesField',
+          fullPath: 'phonesField.primaryPhoneCallingCode',
+          column: 'phonesFieldPrimaryPhoneCallingCode',
+        },
+      ]),
+    );
+  });
+
   it('ignores non-unique fields', () => {
     const fields = [idField, phonesNotUniqueField];
     const flatObjectMetadata = buildFlatObjectMetadata(fields);
diff --git a/packages/twenty-server/src/engine/api/common/common-query-runners/common-create-many-query-runner/utils/get-conflicting-fields.util.ts b/packages/twenty-server/src/engine/api/common/common-query-runners/common-create-many-query-runner/utils/get-conflicting-fields.util.ts
index 4207ef12da4..7a85a6c43ae 100644
--- a/packages/twenty-server/src/engine/api/common/common-query-runners/common-create-many-query-runner/utils/get-conflicting-fields.util.ts
+++ b/packages/twenty-server/src/engine/api/common/common-query-runners/common-create-many-query-runner/utils/get-conflicting-fields.util.ts
@@ -32,18 +32,14 @@ export const getConflictingFields = (
         ];
       }
 
-      const property = compositeType.properties.find(
+      const uniqueProperties = compositeType.properties.filter(
         (prop) => prop.isIncludedInUniqueConstraint,
       );
 
-      return property
-        ? [
-            {
-              baseField: field.name,
-              fullPath: `${field.name}.${property.name}`,
-              column: `${field.name}${capitalize(property.name)}`,
-            },
-          ]
-        : [];
+      return uniqueProperties.map((property) => ({
+        baseField: field.name,
+        fullPath: `${field.name}.${property.name}`,
+        column: `${field.name}${capitalize(property.name)}`,
+      }));
     });
 };
diff --git a/packages/twenty-server/src/engine/api/graphql/workspace-query-runner/utils/find-conflicting-record.util.ts b/packages/twenty-server/src/engine/api/graphql/workspace-query-runner/utils/find-conflicting-record.util.ts
index d3ea578dcff..0f75d90fbdb 100644
--- a/packages/twenty-server/src/engine/api/graphql/workspace-query-runner/utils/find-conflicting-record.util.ts
+++ b/packages/twenty-server/src/engine/api/graphql/workspace-query-runner/utils/find-conflicting-record.util.ts
@@ -28,17 +28,15 @@ export const findConflictingRecord = async (
       return field.name === columnName;
     }
 
-    const property = compositeType.properties.find(
+    const uniqueProperties = compositeType.properties.filter(
       (prop) => prop.isIncludedInUniqueConstraint,
     );
 
-    if (!property) {
-      return false;
-    }
+    return uniqueProperties.some((property) => {
+      const expectedColumnName = `${field.name}${capitalize(property.name)}`;
 
-    const expectedColumnName = `${field.name}${capitalize(property.name)}`;
-
-    return expectedColumnName === columnName;
+      return expectedColumnName === columnName;
+    });
   });
 
   if (!matchingField) {
diff --git a/packages/twenty-shared/src/types/composite-types/phones.composite-type.ts b/packages/twenty-shared/src/types/composite-types/phones.composite-type.ts
index dbba0a336c8..022877d49bc 100644
--- a/packages/twenty-shared/src/types/composite-types/phones.composite-type.ts
+++ b/packages/twenty-shared/src/types/composite-types/phones.composite-type.ts
@@ -23,6 +23,7 @@ export const phonesCompositeType: CompositeType = {
       type: FieldMetadataType.TEXT,
       hidden: false,
       isRequired: false,
+      isIncludedInUniqueConstraint: true,
     },
     {
       name: 'additionalPhones',