diff --git a/doc/api/resources/customers.rst b/doc/api/resources/customers.rst
index 251a06c8a..06f4ebd16 100644
--- a/doc/api/resources/customers.rst
+++ b/doc/api/resources/customers.rst
@@ -19,6 +19,7 @@ external_identifier                   string                     External ID of
                                                                  the API, but is read-only for customers created through a
                                                                  SSO integration.
 email                                 string                     Customer email address
+phone                                 string                     Customer phone number
 name                                  string                     Name of this customer (or ``null``)
 name_parts                            object of strings          Decomposition of name (i.e. given name, family name)
 is_active                             boolean                    Whether this account is active
@@ -39,6 +40,10 @@ password                              string                     Can only be set
 
    Passwords can now be set through the API during customer creation.
 
+.. versionchanged:: 2024.3
+
+   The attribute ``phone`` has been added.
+
 Endpoints
 ---------
 
@@ -71,6 +76,7 @@ Endpoints
             "identifier": "8WSAJCJ",
             "external_identifier": null,
             "email": "customer@example.org",
+            "phone": "+493012345678",
             "name": "John Doe",
             "name_parts": {
                 "_scheme": "full",
@@ -118,6 +124,7 @@ Endpoints
         "identifier": "8WSAJCJ",
         "external_identifier": null,
         "email": "customer@example.org",
+        "phone": "+493012345678",
         "name": "John Doe",
         "name_parts": {
             "_scheme": "full",
@@ -155,6 +162,7 @@ Endpoints
 
       {
         "email": "test@example.org",
+        "phone": "+493012345678",
         "password": "verysecret",
         "send_email": true
       }
@@ -171,6 +179,7 @@ Endpoints
         "identifier": "8WSAJCJ",
         "external_identifier": null,
         "email": "test@example.org",
+        "phone": "+493012345678",
         ...
       }
 
@@ -215,6 +224,7 @@ Endpoints
         "identifier": "8WSAJCJ",
         "external_identifier": null,
         "email": "test@example.org",
+        "phone": "+493012345678",
         …
       }
 
@@ -249,6 +259,7 @@ Endpoints
         "identifier": "8WSAJCJ",
         "external_identifier": null,
         "email": null,
+        "phone": null,
         …
       }
 
diff --git a/src/pretix/api/serializers/organizer.py b/src/pretix/api/serializers/organizer.py
index 68bdb6bf4..5fce6adee 100644
--- a/src/pretix/api/serializers/organizer.py
+++ b/src/pretix/api/serializers/organizer.py
@@ -79,8 +79,8 @@ class CustomerSerializer(I18nAwareModelSerializer):
 
     class Meta:
         model = Customer
-        fields = ('identifier', 'external_identifier', 'email', 'name', 'name_parts', 'is_active', 'is_verified', 'last_login', 'date_joined',
-                  'locale', 'last_modified', 'notes')
+        fields = ('identifier', 'external_identifier', 'email', 'phone', 'name', 'name_parts', 'is_active',
+                  'is_verified', 'last_login', 'date_joined', 'locale', 'last_modified', 'notes')
 
     def update(self, instance, validated_data):
         if instance and instance.provider_id:
diff --git a/src/tests/api/test_customers.py b/src/tests/api/test_customers.py
index 0b0b5bc36..9d8f38168 100644
--- a/src/tests/api/test_customers.py
+++ b/src/tests/api/test_customers.py
@@ -29,6 +29,7 @@ def customer(organizer, event):
     return organizer.customers.create(
         identifier="8WSAJCJ",
         email="foo@example.org",
+        phone="+493012345678",
         name_parts={"_legacy": "Foo"},
         name_cached="Foo",
         is_verified=False,
@@ -39,6 +40,7 @@ TEST_CUSTOMER_RES = {
     "identifier": "8WSAJCJ",
     "external_identifier": None,
     "email": "foo@example.org",
+    "phone": "+493012345678",
     "name": "Foo",
     "name_parts": {
         "_legacy": "Foo",
diff --git a/src/tests/api/test_reusable_media.py b/src/tests/api/test_reusable_media.py
index 9688f2d65..242dddaf9 100644
--- a/src/tests/api/test_reusable_media.py
+++ b/src/tests/api/test_reusable_media.py
@@ -155,6 +155,7 @@ def test_medium_detail(token_client, organizer, event, medium, giftcard, custome
             "identifier": customer.identifier,
             "external_identifier": None,
             "email": "foo@example.org",
+            "phone": None,
             "name": "Foo",
             "name_parts": {"_legacy": "Foo"},
             "is_active": True,