diff --git a/packages/twenty-front/src/modules/object-record/record-field/ui/validation-schemas/__tests__/phonesFieldDefaultValueSchema.test.ts b/packages/twenty-front/src/modules/object-record/record-field/ui/validation-schemas/__tests__/phonesFieldDefaultValueSchema.test.ts
new file mode 100644
index 0000000000..ff311c3f2b
--- /dev/null
+++ b/packages/twenty-front/src/modules/object-record/record-field/ui/validation-schemas/__tests__/phonesFieldDefaultValueSchema.test.ts
@@ -0,0 +1,27 @@
+import { phonesFieldDefaultValueSchema } from '@/object-record/record-field/ui/validation-schemas/phonesFieldDefaultValueSchema';
+import { phonesFieldValueSchema } from '@/object-record/record-field/ui/validation-schemas/phonesFieldValueSchema';
+
+describe('phonesFieldDefaultValueSchema', () => {
+  it('should accept a fully populated default value', () => {
+    const value = {
+      primaryPhoneNumber: "'123456'",
+      primaryPhoneCountryCode: "'FR'",
+      primaryPhoneCallingCode: "'33'",
+      additionalPhones: null,
+    };
+
+    expect(phonesFieldDefaultValueSchema.safeParse(value).success).toBe(true);
+  });
+
+  it('should accept a default value with null primary phone subfields', () => {
+    const value = {
+      primaryPhoneNumber: null,
+      primaryPhoneCountryCode: "'FR'",
+      primaryPhoneCallingCode: "'33'",
+      additionalPhones: null,
+    };
+
+    expect(phonesFieldDefaultValueSchema.safeParse(value).success).toBe(true);
+    expect(phonesFieldValueSchema.safeParse(value).success).toBe(false);
+  });
+});
diff --git a/packages/twenty-front/src/modules/object-record/record-field/ui/validation-schemas/phonesFieldDefaultValueSchema.ts b/packages/twenty-front/src/modules/object-record/record-field/ui/validation-schemas/phonesFieldDefaultValueSchema.ts
new file mode 100644
index 0000000000..a444d0dfdd
--- /dev/null
+++ b/packages/twenty-front/src/modules/object-record/record-field/ui/validation-schemas/phonesFieldDefaultValueSchema.ts
@@ -0,0 +1,16 @@
+import { z } from 'zod';
+
+export const phonesFieldDefaultValueSchema = z.object({
+  primaryPhoneNumber: z.string().nullable(),
+  primaryPhoneCountryCode: z.string().nullable(),
+  primaryPhoneCallingCode: z.string().nullable().optional(),
+  additionalPhones: z
+    .array(
+      z.object({
+        number: z.string(),
+        callingCode: z.string(),
+        countryCode: z.string(),
+      }),
+    )
+    .nullable(),
+});
diff --git a/packages/twenty-front/src/modules/settings/data-model/fields/forms/phones/components/SettingsDataModelFieldPhonesForm.tsx b/packages/twenty-front/src/modules/settings/data-model/fields/forms/phones/components/SettingsDataModelFieldPhonesForm.tsx
index 365215a080..2a088613b8 100644
--- a/packages/twenty-front/src/modules/settings/data-model/fields/forms/phones/components/SettingsDataModelFieldPhonesForm.tsx
+++ b/packages/twenty-front/src/modules/settings/data-model/fields/forms/phones/components/SettingsDataModelFieldPhonesForm.tsx
@@ -1,7 +1,7 @@
 import { Controller, useFormContext } from 'react-hook-form';
 
 import { useFieldMetadataItemById } from '@/object-metadata/hooks/useFieldMetadataItemById';
-import { phonesFieldValueSchema } from '@/object-record/record-field/ui/validation-schemas/phonesFieldValueSchema';
+import { phonesFieldDefaultValueSchema } from '@/object-record/record-field/ui/validation-schemas/phonesFieldDefaultValueSchema';
 import { SettingsOptionCardContentSelect } from '@/settings/components/SettingsOptions/SettingsOptionCardContentSelect';
 import { mergeSettingsSchemas } from '@/settings/data-model/fields/forms/utils/mergeSettingsSchema';
 import { settingsDataModelFieldMaxValuesSchema } from '@/settings/data-model/fields/forms/utils/settingsDataModelFieldMaxValuesSchema';
@@ -28,7 +28,7 @@ type SettingsDataModelFieldPhonesFormProps = {
 
 export const settingsDataModelFieldPhonesFormSchema = z
   .object({
-    defaultValue: phonesFieldValueSchema,
+    defaultValue: phonesFieldDefaultValueSchema,
   })
   .merge(
     mergeSettingsSchemas(
@@ -91,7 +91,7 @@ export const SettingsDataModelFieldPhonesForm = ({
             <Select<string>
               dropdownId="selectDefaultCountryCode"
               value={stripSimpleQuotesFromString(
-                value?.primaryPhoneCountryCode,
+                value?.primaryPhoneCountryCode ?? '',
               )}
               onChange={(newPhoneCountryCode) =>
                 onChange({