diff --git a/common/djangoapps/student/models.py b/common/djangoapps/student/models.py
index e4bfc9398d..42d7a9fbea 100644
--- a/common/djangoapps/student/models.py
+++ b/common/djangoapps/student/models.py
@@ -503,7 +503,7 @@ class UserProfile(models.Model):
     allow_certificate = models.BooleanField(default=1)
     bio = models.CharField(blank=True, null=True, max_length=3000, db_index=False)
     profile_image_uploaded_at = models.DateTimeField(null=True, blank=True)
-    phone_regex = RegexValidator(regex=r'^\+?1?\d*$', message="Phone number can only contain numbers.")
+    phone_regex = RegexValidator(regex=r'^\+?\d*$', message="Phone number can only contain numbers.")
     phone_number = models.CharField(validators=[phone_regex], blank=True, null=True, max_length=50)
 
     @property
diff --git a/lms/envs/common.py b/lms/envs/common.py
index 020fe37e45..8cc8b00b4a 100644
--- a/lms/envs/common.py
+++ b/lms/envs/common.py
@@ -3264,6 +3264,7 @@ ACCOUNT_VISIBILITY_CONFIGURATION["admin_fields"] = (
         "requires_parental_consent",
         "secondary_email",
         "year_of_birth",
+        "phone_number",
     ]
 )
 
diff --git a/openedx/core/djangoapps/user_api/accounts/serializers.py b/openedx/core/djangoapps/user_api/accounts/serializers.py
index e492bc5196..87eb1436cd 100644
--- a/openedx/core/djangoapps/user_api/accounts/serializers.py
+++ b/openedx/core/djangoapps/user_api/accounts/serializers.py
@@ -140,6 +140,7 @@ class UserReadOnlySerializer(serializers.Serializer):
             "account_privacy": self.configuration.get('default_visibility'),
             "social_links": None,
             "extended_profile_fields": None,
+            "phone_number": None,
         }
 
         if user_profile:
@@ -167,6 +168,7 @@ class UserReadOnlySerializer(serializers.Serializer):
                         user_profile.social_links.all().order_by('platform'), many=True
                     ).data,
                     "extended_profile": get_extended_profile(user_profile),
+                    "phone_number": user_profile.phone_number,
                 }
             )
 
@@ -226,7 +228,8 @@ class AccountLegacyProfileSerializer(serializers.HyperlinkedModelSerializer, Rea
         model = UserProfile
         fields = (
             "name", "gender", "goals", "year_of_birth", "level_of_education", "country", "social_links",
-            "mailing_address", "bio", "profile_image", "requires_parental_consent", "language_proficiencies"
+            "mailing_address", "bio", "profile_image", "requires_parental_consent", "language_proficiencies",
+            "phone_number"
         )
         # Currently no read-only field, but keep this so view code doesn't need to know.
         read_only_fields = ()
@@ -292,6 +295,12 @@ class AccountLegacyProfileSerializer(serializers.HyperlinkedModelSerializer, Rea
         """
         return AccountLegacyProfileSerializer.convert_empty_to_None(value)
 
+    def transform_phone_number(self, user_profile, value):  # pylint: disable=unused-argument
+        """
+        Converts empty string to None, to indicate not set. Replaced by to_representation in version 3.
+        """
+        return AccountLegacyProfileSerializer.convert_empty_to_None(value)
+
     @staticmethod
     def convert_empty_to_None(value):
         """
diff --git a/openedx/core/djangoapps/user_api/accounts/tests/test_api.py b/openedx/core/djangoapps/user_api/accounts/tests/test_api.py
index cea200d797..2fdc51205c 100644
--- a/openedx/core/djangoapps/user_api/accounts/tests/test_api.py
+++ b/openedx/core/djangoapps/user_api/accounts/tests/test_api.py
@@ -536,6 +536,7 @@ class AccountSettingsOnCreationTest(CreateAccountMixin, TestCase):
             'secondary_email': None,
             'time_zone': None,
             'course_certificates': None,
+            'phone_number': None,
         })
 
     def test_normalize_password(self):
diff --git a/openedx/core/djangoapps/user_api/accounts/tests/test_views.py b/openedx/core/djangoapps/user_api/accounts/tests/test_views.py
index 414ca9e097..bc52cc585c 100644
--- a/openedx/core/djangoapps/user_api/accounts/tests/test_views.py
+++ b/openedx/core/djangoapps/user_api/accounts/tests/test_views.py
@@ -115,6 +115,7 @@ class UserAPITestCase(APITestCase):
         legacy_profile.bio = TEST_BIO_VALUE
         legacy_profile.profile_image_uploaded_at = TEST_PROFILE_IMAGE_UPLOADED_AT
         legacy_profile.language_proficiencies.create(code=TEST_LANGUAGE_PROFICIENCY_CODE)
+        legacy_profile.phone_number = "+18005555555"
         legacy_profile.save()
 
     def _verify_profile_image_data(self, data, has_profile_image):
@@ -265,7 +266,7 @@ class TestAccountsAPI(CacheIsolationTestCase, UserAPITestCase):
         Verify that all account fields are returned (even those that are not shareable).
         """
         data = response.data
-        self.assertEqual(22, len(data))
+        self.assertEqual(23, len(data))
 
         # public fields (3)
         expected_account_privacy = (
@@ -474,7 +475,7 @@ class TestAccountsAPI(CacheIsolationTestCase, UserAPITestCase):
             with self.assertNumQueries(queries):
                 response = self.send_get(self.client)
             data = response.data
-            self.assertEqual(22, len(data))
+            self.assertEqual(23, len(data))
             self.assertEqual(self.user.username, data["username"])
             self.assertEqual(self.user.first_name + " " + self.user.last_name, data["name"])
             for empty_field in ("year_of_birth", "level_of_education", "mailing_address", "bio"):
@@ -885,7 +886,7 @@ class TestAccountsAPI(CacheIsolationTestCase, UserAPITestCase):
         response = self.send_get(client)
         if has_full_access:
             data = response.data
-            self.assertEqual(22, len(data))
+            self.assertEqual(23, len(data))
             self.assertEqual(self.user.username, data["username"])
             self.assertEqual(self.user.first_name + " " + self.user.last_name, data["name"])
             self.assertEqual(self.user.email, data["email"])
diff --git a/openedx/core/djangoapps/user_api/accounts/views.py b/openedx/core/djangoapps/user_api/accounts/views.py
index 2d8eb44b0a..643c3ae22c 100644
--- a/openedx/core/djangoapps/user_api/accounts/views.py
+++ b/openedx/core/djangoapps/user_api/accounts/views.py
@@ -227,6 +227,9 @@ class AccountViewSet(ViewSet):
             * accomplishments_shared: Signals whether badges are enabled on the
               platform and should be fetched.
 
+            * phone_number: The phone number for the user. String of numbers with
+              an optional `+` sign at the start.
+
             For all text fields, plain text instead of HTML is supported. The
             data is stored exactly as specified. Clients must HTML escape
             rendered values to avoid script injections.