diff --git a/app/clients/cloudwatch/aws_cloudwatch.py b/app/clients/cloudwatch/aws_cloudwatch.py
index eb8343810..9c1d1e61c 100644
--- a/app/clients/cloudwatch/aws_cloudwatch.py
+++ b/app/clients/cloudwatch/aws_cloudwatch.py
@@ -1,7 +1,6 @@
 import json
 import os
 import re
-import time
 from datetime import datetime, timedelta
 
 from boto3 import client
@@ -51,25 +50,30 @@ class AwsCloudwatchClient(Client):
 
     def _get_log(self, my_filter, log_group_name, sent_at):
         # Check all cloudwatch logs from the time the notification was sent (currently 5 minutes previously) until now
-        now = round(time.time() * 1000)
+        now = datetime.utcnow()
         beginning = sent_at
         next_token = None
         all_log_events = []
+        current_app.logger.info(f"START TIME {beginning} END TIME {now}")
+        # There has been a change somewhere and the time range we were previously using has become too
+        # narrow or wrong in some way, so events can't be found.  For the time being, adjust by adding
+        # a buffer on each side of 12 hours.
+        TWELVE_HOURS = 12 * 60 * 60 * 1000
         while True:
             if next_token:
                 response = self._client.filter_log_events(
                     logGroupName=log_group_name,
                     filterPattern=my_filter,
                     nextToken=next_token,
-                    startTime=int(beginning.timestamp() * 1000),
-                    endTime=now,
+                    startTime=int(beginning.timestamp() * 1000) - TWELVE_HOURS,
+                    endTime=int(now.timestamp() * 1000) + TWELVE_HOURS,
                 )
             else:
                 response = self._client.filter_log_events(
                     logGroupName=log_group_name,
                     filterPattern=my_filter,
-                    startTime=int(beginning.timestamp() * 1000),
-                    endTime=now,
+                    startTime=int(beginning.timestamp() * 1000) - TWELVE_HOURS,
+                    endTime=int(now.timestamp() * 1000) + TWELVE_HOURS,
                 )
             log_events = response.get("events", [])
             all_log_events.extend(log_events)
@@ -87,6 +91,7 @@ class AwsCloudwatchClient(Client):
         return account_number
 
     def check_sms(self, message_id, notification_id, created_at):
+        current_app.logger.info(f"CREATED AT = {created_at}")
         region = cloud_config.sns_region
         # TODO this clumsy approach to getting the account number will be fixed as part of notify-api #258
         account_number = self._extract_account_number(cloud_config.ses_domain_arn)
@@ -128,7 +133,7 @@ class AwsCloudwatchClient(Client):
         if time_now > (created_at + timedelta(hours=3)):
             # see app/models.py Notification. This message corresponds to "permanent-failure",
             # but we are copy/pasting here to avoid circular imports.
-            return "failure", "Unable to find carrier response.", "unknown"
+            return "failure", "Unable to find carrier response."
         raise NotificationTechnicalFailureException(
             f"No event found for message_id {message_id} notification_id {notification_id}"
         )
diff --git a/app/dao/notifications_dao.py b/app/dao/notifications_dao.py
index 6c59aaec2..61fba4f6f 100644
--- a/app/dao/notifications_dao.py
+++ b/app/dao/notifications_dao.py
@@ -304,12 +304,17 @@ def _filter_query(query, filter_dict=None):
     return query
 
 
-def sanitize_successful_notification_by_id(notification_id, provider_response):
+def sanitize_successful_notification_by_id(notification_id, carrier, provider_response):
     update_query = """
-    update notifications set provider_response=:response, notification_status='delivered', "to"='1', normalised_to='1'
+    update notifications set provider_response=:response, carrier=:carrier,
+    notification_status='delivered', "to"='1', normalised_to='1'
     where id=:notification_id
     """
-    input_params = {"notification_id": notification_id, "response": provider_response}
+    input_params = {
+        "notification_id": notification_id,
+        "carrier": carrier,
+        "response": provider_response,
+    }
 
     db.session.execute(update_query, input_params)
     db.session.commit()
diff --git a/app/models.py b/app/models.py
index 1cba15c6b..c46aa6bd9 100644
--- a/app/models.py
+++ b/app/models.py
@@ -554,8 +554,8 @@ class Service(db.Model, Versioned):
 
     def get_default_sms_sender(self):
         default_sms_sender = [x for x in self.service_sms_senders if x.is_default]
-        return "sns"
-        # return default_sms_sender[0].sms_sender
+        # return "sns"
+        return default_sms_sender[0].sms_sender
 
     def get_default_reply_to_email_address(self):
         default_reply_to = [x for x in self.reply_to_email_addresses if x.is_default]
diff --git a/tests/app/clients/test_aws_cloudwatch.py b/tests/app/clients/test_aws_cloudwatch.py
index 6662d2edb..5eeffb979 100644
--- a/tests/app/clients/test_aws_cloudwatch.py
+++ b/tests/app/clients/test_aws_cloudwatch.py
@@ -30,7 +30,8 @@ def side_effect(filterPattern, logGroupName, startTime, endTime):
             "events": [
                 {
                     "logStreamName": "89db9712-c6d1-49f9-be7c-4caa7ed9efb1",
-                    "message": '{"delivery":{"destination":"+1661","providerResponse":"Invalid phone number"}}',
+                    "message": '{"delivery":{"destination":"+1661","phoneCarrier":"ATT Mobility", '
+                    '"providerResponse":"Invalid phone number"}}',
                     "eventId": "37535432778099870001723210579798865345508698025292922880",
                 }
             ]
@@ -42,7 +43,8 @@ def side_effect(filterPattern, logGroupName, startTime, endTime):
                 {
                     "logStreamName": "89db9712-c6d1-49f9-be7c-4caa7ed9efb1",
                     "timestamp": 1683147017911,
-                    "message": '{"delivery":{"destination":"+1661","providerResponse":"Phone accepted msg"}}',
+                    "message": '{"delivery":{"destination":"+1661","phoneCarrier":"ATT Mobility",'
+                    '"providerResponse":"Phone accepted msg"}}',
                     "ingestionTime": 1683147018026,
                     "eventId": "37535432778099870001723210579798865345508698025292922880",
                 }
diff --git a/tests/app/dao/notification_dao/test_notification_dao.py b/tests/app/dao/notification_dao/test_notification_dao.py
index babddda1b..a0d19ecd1 100644
--- a/tests/app/dao/notification_dao/test_notification_dao.py
+++ b/tests/app/dao/notification_dao/test_notification_dao.py
@@ -111,7 +111,7 @@ def test_should_be_able_to_sanitize_successful_notification(
 
     with freeze_time("2000-01-02 12:00:00"):
         sanitize_successful_notification_by_id(
-            notification.id, provider_response="Don't know what happened"
+            notification.id, carrier="ATT", provider_response="Don't know what happened"
         )
         assert Notification.query.get(notification.id).status == "delivered"
         assert Notification.query.get(notification.id).normalised_to == "1"
diff --git a/tests/app/v2/notifications/test_get_notifications.py b/tests/app/v2/notifications/test_get_notifications.py
index a618933e3..be03595b9 100644
--- a/tests/app/v2/notifications/test_get_notifications.py
+++ b/tests/app/v2/notifications/test_get_notifications.py
@@ -67,6 +67,7 @@ def test_get_notification_by_id_returns_200(
         "completed_at": sample_notification.completed_at(),
         "scheduled_for": None,
         "provider_response": None,
+        "carrier": None,
     }
 
     assert json_response == expected_response
@@ -122,6 +123,7 @@ def test_get_notification_by_id_with_placeholders_returns_200(
         "completed_at": sample_notification.completed_at(),
         "scheduled_for": None,
         "provider_response": None,
+        "carrier": None
     }
 
     assert json_response == expected_response