diff --git a/app/dao/broadcast_service_dao.py b/app/dao/broadcast_service_dao.py
index 6eb143feb..9971bf316 100644
--- a/app/dao/broadcast_service_dao.py
+++ b/app/dao/broadcast_service_dao.py
@@ -64,7 +64,7 @@ def set_broadcast_service_type(service, service_mode, broadcast_channel, provide
     db.session.add(service)
 
 
-def insert_or_update_service_broadcast_settings(service, channel, provider_restriction=None):
+def insert_or_update_service_broadcast_settings(service, channel, provider_restriction="all"):
     if not service.service_broadcast_settings:
         settings = ServiceBroadcastSettings()
         settings.service = service
diff --git a/app/models.py b/app/models.py
index 378a451ab..9deb78f93 100644
--- a/app/models.py
+++ b/app/models.py
@@ -560,7 +560,8 @@ class Service(db.Model, Versioned):
 
     def get_available_broadcast_providers(self):
         # There may be future checks here if we add, for example, platform admin level provider killswitches.
-        if self.allowed_broadcast_provider:
+        # NOTE: We are in the middle of changing the value for all allowed_broadcast_provider from `None`to "all"
+        if self.allowed_broadcast_provider and self.allowed_broadcast_provider != ALL_BROADCAST_PROVIDERS:
             return [x for x in current_app.config['ENABLED_CBCS'] if x == self.allowed_broadcast_provider]
         else:
             return current_app.config['ENABLED_CBCS']
@@ -2488,6 +2489,9 @@ class BroadcastProvider:
     PROVIDERS = [EE, VODAFONE, THREE, O2]
 
 
+ALL_BROADCAST_PROVIDERS = 'all'
+
+
 class BroadcastProviderMessageStatus:
     TECHNICAL_FAILURE = 'technical-failure'  # Couldn’t send (cbc proxy 5xx/4xx)
     SENDING = 'sending'  # Sent to cbc, awaiting response
diff --git a/app/service/service_broadcast_settings_schema.py b/app/service/service_broadcast_settings_schema.py
index bc18af07d..ad702428c 100644
--- a/app/service/service_broadcast_settings_schema.py
+++ b/app/service/service_broadcast_settings_schema.py
@@ -6,7 +6,7 @@ service_broadcast_settings_schema = {
     "properties": {
         "broadcast_channel": {"enum": ["test", "severe"]},
         "service_mode": {"enum": ["training", "live"]},
-        "provider_restriction": {"enum": [None, "three", "o2", "vodafone", "ee"]}
+        "provider_restriction": {"enum": [None, "three", "o2", "vodafone", "ee", "all"]}
     },
     "required": ["broadcast_channel", "service_mode", "provider_restriction"]
 }
diff --git a/tests/app/celery/test_broadcast_message_tasks.py b/tests/app/celery/test_broadcast_message_tasks.py
index 8d65108b6..774df9cb9 100644
--- a/tests/app/celery/test_broadcast_message_tasks.py
+++ b/tests/app/celery/test_broadcast_message_tasks.py
@@ -30,7 +30,14 @@ from tests.app.db import (
 from tests.conftest import set_config
 
 
-def test_send_broadcast_event_queues_up_for_active_providers(mocker, notify_api, sample_broadcast_service):
+@pytest.mark.parametrize('available_provider', [None, 'all'])
+def test_send_broadcast_event_queues_up_for_active_providers(
+    mocker,
+    notify_api,
+    sample_broadcast_service,
+    available_provider,
+):
+    sample_broadcast_service.allowed_broadcast_provider = available_provider
     template = create_template(sample_broadcast_service, BROADCAST_TYPE)
     broadcast_message = create_broadcast_message(template, status=BroadcastStatusType.BROADCASTING)
     event = create_broadcast_event(broadcast_message)
diff --git a/tests/app/service/test_rest.py b/tests/app/service/test_rest.py
index 7484d6203..a4cc55007 100644
--- a/tests/app/service/test_rest.py
+++ b/tests/app/service/test_rest.py
@@ -290,6 +290,8 @@ def test_get_service_by_id(admin_request, sample_service):
 
 
 @pytest.mark.parametrize('broadcast_channel,allowed_broadcast_provider', (
+    ('test', 'all'),
+    ('severe', 'all'),
     ('test', None),
     ('severe', None),
     ('test', 'ee'),
@@ -4018,7 +4020,7 @@ def test_set_as_broadcast_service_rejects_if_no_service_mode(
     )
 
 
-@pytest.mark.parametrize('provider', [None, "three", "ee", "vodafone", "o2"])
+@pytest.mark.parametrize('provider', [None, "all", "three", "ee", "vodafone", "o2"])
 def test_set_as_broadcast_service_sets_mobile_provider_restriction(
     admin_request, sample_service, broadcast_organisation, provider
 ):