diff --git a/tests/app/conftest.py b/tests/app/conftest.py
index 3d6402da2..4503d90c2 100644
--- a/tests/app/conftest.py
+++ b/tests/app/conftest.py
@@ -39,7 +39,14 @@ from app.dao.invited_user_dao import save_invited_user
 from app.dao.provider_rates_dao import create_provider_rates
 from app.clients.sms.firetext import FiretextClient
 from tests import create_authorization_header
-from tests.app.db import create_user, create_template, create_notification, create_api_key, create_inbound_number
+from tests.app.db import (
+    create_user,
+    create_template,
+    create_notification,
+    create_service,
+    create_api_key,
+    create_inbound_number
+)
 
 
 @pytest.yield_fixture
@@ -985,9 +992,10 @@ def sample_provider_rate(notify_db, notify_db_session, valid_from=None, rate=Non
 
 @pytest.fixture
 def sample_inbound_numbers(notify_db, notify_db_session, sample_service):
+    service = create_service(service_name='sample service 2')
     inbound_numbers = []
     inbound_numbers.append(create_inbound_number(number='1', provider='mmg'))
-    inbound_numbers.append(create_inbound_number(number='2', provider='mmg', active=False))
+    inbound_numbers.append(create_inbound_number(number='2', provider='mmg', active=False, service_id=service.id))
     inbound_numbers.append(create_inbound_number(number='3', provider='firetext', service_id=sample_service.id))
     return inbound_numbers
 
@@ -1043,8 +1051,11 @@ def admin_request(client):
                 data=json.dumps(_data),
                 headers=[('Content-Type', 'application/json'), create_authorization_header()]
             )
-            json_resp = json.loads(resp.get_data(as_text=True))
-            assert resp.status_code == _expected_status, json_resp
+            if resp.get_data(as_text=True):
+                json_resp = json.loads(resp.get_data(as_text=True))
+            else:
+                json_resp = None
+            assert resp.status_code == _expected_status
             return json_resp
 
         @staticmethod
diff --git a/tests/app/dao/test_inbound_numbers_dao.py b/tests/app/dao/test_inbound_numbers_dao.py
index 333ea5d10..40b2db478 100644
--- a/tests/app/dao/test_inbound_numbers_dao.py
+++ b/tests/app/dao/test_inbound_numbers_dao.py
@@ -5,11 +5,12 @@ from app.dao.inbound_numbers_dao import (
     dao_get_inbound_numbers,
     dao_get_available_inbound_numbers,
     dao_get_inbound_number_for_service,
-    dao_set_inbound_number_to_service
+    dao_set_inbound_number_to_service,
+    dao_set_inbound_number_active_flag_for_service
 )
 from app.models import InboundNumber
 
-from tests.app.db import create_service
+from tests.app.db import create_service, create_inbound_number
 
 
 def test_get_inbound_numbers(notify_db, notify_db_session, sample_inbound_numbers):
@@ -26,7 +27,7 @@ def test_get_available_inbound_numbers(notify_db, notify_db_session, sample_inbo
     assert res[0] == sample_inbound_numbers[0]
 
 
-def test_allocate_inbound_number_to_service(notify_db, notify_db_session, sample_inbound_numbers):
+def test_set_service_id_on_inbound_number(notify_db, notify_db_session, sample_inbound_numbers):
     service = create_service(service_name='test service')
     numbers = dao_get_available_inbound_numbers()
 
@@ -38,9 +39,34 @@ def test_allocate_inbound_number_to_service(notify_db, notify_db_session, sample
     assert res[0].service_id == service.id
 
 
-def test_allocating_a_service_twice_will_raise_an_error(notify_db, notify_db_session, sample_inbound_numbers):
-    from tests.app.db import create_inbound_number
-    create_inbound_number(number='4', provider='mmg')
+def test_after_setting_service_id_that_inbound_number_is_unavailable(
+        notify_db, notify_db_session, sample_inbound_numbers):
+    service = create_service(service_name='test service')
+    numbers = dao_get_available_inbound_numbers()
+
+    assert len(numbers) == 1
+
+    dao_set_inbound_number_to_service(service.id, numbers[0])
+
+    res = dao_get_available_inbound_numbers()
+
+    assert len(res) == 0
+
+
+def test_get_inbound_number_for_service(notify_db, notify_db_session, sample_inbound_numbers):
+    service = create_service(service_name='test service')
+    inbound_number = create_inbound_number(number='4')
+
+    dao_set_inbound_number_to_service(service.id, inbound_number)
+
+    res = dao_get_inbound_number_for_service(service.id)
+
+    assert res.service_id == service.id
+
+
+def test_setting_a_service_twice_will_raise_an_error(notify_db, notify_db_session):
+    create_inbound_number(number='1')
+    create_inbound_number(number='2')
     service = create_service(service_name='test service')
     numbers = dao_get_available_inbound_numbers()
 
@@ -49,15 +75,19 @@ def test_allocating_a_service_twice_will_raise_an_error(notify_db, notify_db_ses
     with pytest.raises(IntegrityError) as e:
         dao_set_inbound_number_to_service(service.id, numbers[1])
 
-    res = InboundNumber.query.filter(InboundNumber.service_id == service.id).all()
+    res = dao_get_inbound_number_for_service(service.id)
 
-    assert len(res) == 1
-    assert res[0].service_id == service.id
+    assert res.service_id == service.id
     assert 'duplicate key value violates unique constraint' in str(e.value)
 
 
-def test_get_inbound_number_for_service(notify_db, notify_db_session, sample_inbound_numbers, sample_service):
-    res = dao_get_inbound_number_for_service(sample_service.id)
+@pytest.mark.parametrize("active", [True, False])
+def test_set_inbound_number_active_flag(notify_db, notify_db_session, sample_service, active):
+    inbound_number = create_inbound_number(number='1')
+    dao_set_inbound_number_to_service(sample_service.id, inbound_number)
 
-    assert len(res) == 1
-    assert res[0].service_id == sample_service.id
+    dao_set_inbound_number_active_flag_for_service(sample_service.id, active=active)
+
+    inbound_number = dao_get_inbound_number_for_service(sample_service.id)
+
+    assert inbound_number.active is active