diff --git a/app/dao/inbound_numbers_dao.py b/app/dao/inbound_numbers_dao.py
index 4a4143ffa..085ed3f22 100644
--- a/app/dao/inbound_numbers_dao.py
+++ b/app/dao/inbound_numbers_dao.py
@@ -22,7 +22,6 @@ def dao_get_inbound_number(inbound_number_id):
 @transactional
 def dao_set_inbound_number_to_service(service_id, inbound_number):
     inbound_number.service_id = service_id
-
     db.session.add(inbound_number)
 
 
diff --git a/app/inbound_number/rest.py b/app/inbound_number/rest.py
index 7d87f68b4..f2d347c01 100644
--- a/app/inbound_number/rest.py
+++ b/app/inbound_number/rest.py
@@ -2,6 +2,7 @@ from flask import Blueprint, jsonify, request
 
 from app.dao.inbound_numbers_dao import (
     dao_get_inbound_numbers,
+    dao_get_inbound_number,
     dao_get_inbound_number_for_service,
     dao_get_available_inbound_numbers,
     dao_set_inbound_number_to_service,
@@ -22,8 +23,15 @@ def get_inbound_numbers():
     return jsonify(data=inbound_numbers)
 
 
-@inbound_number_blueprint.route('/<uuid:service_id>', methods=['POST'])
-def post_allocate_or_reactivate_inbound_number(service_id):
+@inbound_number_blueprint.route('/available', methods=['GET'])
+def get_inbound_numbers_available():
+    inbound_numbers = [i.serialize() for i in dao_get_available_inbound_numbers()]
+
+    return jsonify(data=inbound_numbers)
+
+
+@inbound_number_blueprint.route('/service/<uuid:service_id>', methods=['POST'])
+def post_allocate_inbound_number(service_id):
     inbound_number = dao_get_inbound_number_for_service(service_id)
 
     if not inbound_number:
@@ -39,7 +47,25 @@ def post_allocate_or_reactivate_inbound_number(service_id):
         return '', 204
 
 
-@inbound_number_blueprint.route('/<uuid:service_id>/off', methods=['POST'])
-def post_deactivate_inbound_number(service_id):
-    dao_set_inbound_number_active_flag(service_id, active=False)
+@inbound_number_blueprint.route('/<uuid:inbound_number_id>/service/<uuid:service_id>', methods=['POST'])
+def post_set_inbound_number_for_service(inbound_number_id, service_id):
+    try:
+        dao_set_inbound_number_to_service(service_id, inbound_number_id)
+    except TypeError as e:
+        if str(e) == 'UUID objects are immutable':
+            return '', 409
+        else:
+            raise e
+    return '', 204
+
+
+@inbound_number_blueprint.route('/service/<uuid:inbound_number_id>/on', methods=['POST'])
+def post_set_inbound_number_on(inbound_number_id):
+    dao_set_inbound_number_active_flag(inbound_number_id, active=True)
+    return '', 204
+
+
+@inbound_number_blueprint.route('/<uuid:inbound_number_id>/off', methods=['POST'])
+def post_set_inbound_number_off(inbound_number_id):
+    dao_set_inbound_number_active_flag(inbound_number_id, active=False)
     return '', 204
diff --git a/tests/app/inbound_number/test_rest.py b/tests/app/inbound_number/test_rest.py
index ee3115e0c..88b2b5661 100644
--- a/tests/app/inbound_number/test_rest.py
+++ b/tests/app/inbound_number/test_rest.py
@@ -4,6 +4,7 @@ import json
 from app.models import InboundNumber
 from app.dao.inbound_numbers_dao import (
     dao_get_inbound_numbers,
+    dao_get_inbound_number,
     dao_get_available_inbound_numbers,
     dao_get_inbound_number_for_service,
     dao_set_inbound_number_to_service
@@ -22,7 +23,7 @@ def test_rest_get_inbound_numbers(admin_request, sample_inbound_numbers):
 def test_rest_allocate_inbound_number(admin_request, notify_db_session, sample_inbound_numbers):
     service = create_service(service_name='test service')
     admin_request.post(
-        'inbound_number.post_allocate_or_reactivate_inbound_number',
+        'inbound_number.post_allocate_inbound_number',
         _expected_status=204,
         service_id=service.id
     )
@@ -36,35 +37,64 @@ def test_rest_allocate_inbound_number_when_no_inbound_available_returns_409(
     service_2 = create_service(service_name='test service 2')
 
     admin_request.post(
-        'inbound_number.post_allocate_or_reactivate_inbound_number',
+        'inbound_number.post_allocate_inbound_number',
         _expected_status=409,
         service_id=service_2.id
     )
 
 
-def test_rest_deactivate_inbound_number_for_service(admin_request, notify_db_session, sample_inbound_numbers):
-    service = create_service(service_name='test service 1')
-    create_inbound_number(number='4', provider='mmg', active=True, service_id=service.id)
+def test_rest_set_service_to_several_inbound_numbers_returns_409(
+        admin_request, notify_db_session, sample_service):
+    service_1 = create_service(service_name='test service 1')
+    create_inbound_number(number='4', provider='mmg', active=False, service_id=sample_service.id)
+    inbound_number = create_inbound_number(number='5', provider='mmg', active=True, service_id=service_1.id)
+    service_2 = create_service(service_name='test service 2')
 
     admin_request.post(
-        'inbound_number.post_deactivate_inbound_number',
-        _expected_status=204,
-        service_id=service.id
+        'inbound_number.post_set_inbound_number_for_service',
+        _expected_status=409,
+        inbound_number_id=inbound_number.id,
+        service_id=service_2.id
     )
 
-    inbound_number_deactivated = dao_get_inbound_number_for_service(service.id)
-    assert not inbound_number_deactivated.active
 
-
-def test_rest_reactivate_inbound_number_for_service(admin_request, notify_db_session, sample_inbound_numbers):
-    service = create_service(service_name='test service 1')
-    create_inbound_number(number='4', provider='mmg', active=False, service_id=service.id)
+def test_rest_set_number_to_several_services_returns_409(
+        admin_request, notify_db_session, sample_service):
+    service_1 = create_service(service_name='test service 1')
+    inbound_number = create_inbound_number(number='4', provider='mmg', active=False, service_id=sample_service.id)
+    service_2 = create_service(service_name='test service 2')
 
     admin_request.post(
-        'inbound_number.post_allocate_or_reactivate_inbound_number',
-        _expected_status=204,
-        service_id=service.id
+        'inbound_number.post_set_inbound_number_for_service',
+        _expected_status=409,
+        inbound_number_id=inbound_number.id,
+        service_id=service_2.id
     )
 
-    inbound_number_reactivated = dao_get_inbound_number_for_service(service.id)
-    assert inbound_number_reactivated.active
+
+def test_rest_set_inbound_number_active_flag_off(admin_request, notify_db_session):
+    service = create_service(service_name='test service 1')
+    inbound_number = create_inbound_number(number='1', provider='mmg', active=True, service_id=service.id)
+
+    admin_request.post(
+        'inbound_number.post_set_inbound_number_off',
+        _expected_status=204,
+        inbound_number_id=inbound_number.id
+    )
+
+    inbound_number_off = dao_get_inbound_number(inbound_number.id)
+    assert not inbound_number_off.active
+
+
+def test_rest_set_inbound_number_active_flag_on(admin_request, notify_db_session):
+    service = create_service(service_name='test service 1')
+    inbound_number = create_inbound_number(number='1', provider='mmg', active=True, service_id=service.id)
+
+    admin_request.post(
+        'inbound_number.post_set_inbound_number_on',
+        _expected_status=204,
+        inbound_number_id=inbound_number.id
+    )
+
+    inbound_number_on = dao_get_inbound_number(inbound_number.id)
+    assert inbound_number_on.active