diff --git a/app/main/forms.py b/app/main/forms.py
index c1f50a089..820d47c9c 100644
--- a/app/main/forms.py
+++ b/app/main/forms.py
@@ -337,7 +337,7 @@ class ServiceSmsSender(Form):
     def validate_sms_sender(form, field):
         import re
         if field.data and not re.match('^[a-zA-Z0-9\s]+$', field.data):
-            raise ValidationError('Sms text message sender can only contain alpha-numeric characters')
+            raise ValidationError('Text message sender can only contain alpha-numeric characters')
 
 
 class ServiceBrandingOrg(Form):
diff --git a/app/templates/views/text-not-received-2.html b/app/templates/views/text-not-received-2.html
index 4e10ac956..3a49f39a7 100644
--- a/app/templates/views/text-not-received-2.html
+++ b/app/templates/views/text-not-received-2.html
@@ -12,7 +12,7 @@ Check your mobile number – GOV.UK Notify
   <div class="column-two-thirds">
     <h1 class="heading-large">Check your mobile number</h1>
 
-    <p>Check your mobile phone number is correct and then resend the confirmation code.</p>
+    <p>Check your mobile phone number is correct and then resend the security code.</p>
 
       <p>
       <label class="form-label" for="mobile">Mobile phone number</label>
@@ -21,7 +21,7 @@ Check your mobile number – GOV.UK Notify
 
 
       <p>
-      <a class="button" href="verify-mobile" role="button">Resend confirmation code</a>
+      <a class="button" href="verify-mobile" role="button">Resend security code</a>
       </p>
   </div>
 </div>
diff --git a/app/templates/views/text-not-received.html b/app/templates/views/text-not-received.html
index e6bab7546..4ee286f08 100644
--- a/app/templates/views/text-not-received.html
+++ b/app/templates/views/text-not-received.html
@@ -12,11 +12,11 @@ Check your mobile number – GOV.UK Notify
   <div class="column-two-thirds">
     <h1 class="heading-large">Check your mobile number</h1>
 
-    <p>Check your mobile phone number is correct and then resend the confirmation code.</p>
+    <p>Check your mobile phone number is correct and then resend the security code.</p>
 
       <form autocomplete="off" method="post">
         {{ textbox(form.mobile_number) }}
-        {{ page_footer("Resend confirmation code") }}
+        {{ page_footer("Resend security code") }}
       </form>
   </div>
 </div>
diff --git a/app/templates/views/user-profile/confirm.html b/app/templates/views/user-profile/confirm.html
index 069fe0e7e..0a4d8db32 100644
--- a/app/templates/views/user-profile/confirm.html
+++ b/app/templates/views/user-profile/confirm.html
@@ -13,7 +13,7 @@ GOV.UK Notify | Service settings
   <div class="grid-row">
     <div class="column-three-quarters">
       <p>
-        We’ve sent a code to your new {{ thing }}.
+        We’ve sent a security code to your new {{ thing }}.
       </p>
       <form method="post">
         {{ textbox(form_field) }}
diff --git a/app/templates/views/verify-mobile.html b/app/templates/views/verify-mobile.html
index 4cb7135a7..381268f5c 100644
--- a/app/templates/views/verify-mobile.html
+++ b/app/templates/views/verify-mobile.html
@@ -10,7 +10,7 @@ Confirm your  mobile number – GOV.UK Notify
   <div class="column-two-thirds">
     <h1 class="heading-large">Confirm your mobile number</h1>
 
-    <p>We’ve sent you a security code by text message.</p>
+      <p>We’ve sent you a security code by text message.</p>
 
       <p>
       <label class="form-label" for="email">Enter security code<br>
diff --git a/tests/app/main/test_validators.py b/tests/app/main/test_validators.py
index f8b1a6490..5ea1300ca 100644
--- a/tests/app/main/test_validators.py
+++ b/tests/app/main/test_validators.py
@@ -141,4 +141,4 @@ def test_sms_sender_form_validation(app_, mock_get_user_by_email):
 
         form.sms_sender.data = '###########'
         form.validate()
-        assert 'Sms text message sender can only contain alpha-numeric characters' == form.errors['sms_sender'][0]
+        assert 'Text message sender can only contain alpha-numeric characters' == form.errors['sms_sender'][0]
diff --git a/tests/app/main/views/test_code_not_received.py b/tests/app/main/views/test_code_not_received.py
index f7d5f89a7..09c252424 100644
--- a/tests/app/main/views/test_code_not_received.py
+++ b/tests/app/main/views/test_code_not_received.py
@@ -66,7 +66,7 @@ def test_should_render_correct_resend_template_for_pending_user(app_,
             page = BeautifulSoup(response.data.decode('utf-8'), 'html.parser')
             assert page.h1.string == 'Check your mobile number'
 
-            expected = 'Check your mobile phone number is correct and then resend the confirmation code.'
+            expected = 'Check your mobile phone number is correct and then resend the security code.'
             message = page.find_all('p')[1].text
             assert message == expected
             assert page.find('form').input['value'] == api_user_pending.mobile_number