diff --git a/app/schemas.py b/app/schemas.py
index b5172c9d9..ae5ee3d4c 100644
--- a/app/schemas.py
+++ b/app/schemas.py
@@ -1,4 +1,3 @@
-import re
 from datetime import (
     datetime,
     date,
@@ -207,7 +206,6 @@ class ServiceSchema(BaseSchema):
     organisation = field_for(models.Service, 'organisation')
     override_flag = False
     reply_to_email_address = fields.Method(method_name="get_reply_to_email_address")
-    sms_sender = fields.Method(method_name="get_sms_sender")
     letter_contact_block = fields.Method(method_name="get_letter_contact")
 
     def service_permissions(self, service):
@@ -216,9 +214,6 @@ class ServiceSchema(BaseSchema):
     def get_reply_to_email_address(self, service):
         return service.get_default_reply_to_email_address()
 
-    def get_sms_sender(self, service):
-        return service.get_default_sms_sender()
-
     def get_letter_contact(self, service):
         return service.get_default_letter_contact()
 
@@ -242,11 +237,6 @@ class ServiceSchema(BaseSchema):
         )
         strict = True
 
-    @validates('sms_sender')
-    def validate_sms_sender(self, value):
-        if value and not re.match(r'^[a-zA-Z0-9\s]+$', value):
-            raise ValidationError('Only alphanumeric characters allowed')
-
     @validates('permissions')
     def validate_permissions(self, value):
         permissions = [v.permission for v in value]
diff --git a/tests/app/service/test_rest.py b/tests/app/service/test_rest.py
index b1930a511..a7191b183 100644
--- a/tests/app/service/test_rest.py
+++ b/tests/app/service/test_rest.py
@@ -137,7 +137,6 @@ def test_get_service_by_id(admin_request, sample_service):
     assert json_resp['data']['email_branding'] is None
     assert json_resp['data']['branding'] == 'govuk'
     assert json_resp['data']['dvla_organisation'] == '001'
-    assert json_resp['data']['sms_sender'] == current_app.config['FROM_NUMBER']
     assert json_resp['data']['prefix_sms'] is True
 
 
@@ -239,7 +238,6 @@ def test_create_service(client, sample_user):
     assert json_resp['data']['email_from'] == 'created.service'
     assert not json_resp['data']['research_mode']
     assert json_resp['data']['dvla_organisation'] == '001'
-    assert json_resp['data']['sms_sender'] == current_app.config['FROM_NUMBER']
     assert json_resp['data']['rate_limit'] == 3000
 
     service_db = Service.query.get(json_resp['data']['id'])
@@ -1425,7 +1423,6 @@ def test_set_sms_prefixing_for_service(
         _data={'prefix_sms': posted_value},
     )
     assert result['data']['prefix_sms'] == stored_value
-    assert result['data']['sms_sender'] == current_app.config['FROM_NUMBER']
 
 
 def test_set_sms_prefixing_for_service_cant_be_none(