diff --git a/app/main/forms.py b/app/main/forms.py
index c99eeef22..016534ed4 100644
--- a/app/main/forms.py
+++ b/app/main/forms.py
@@ -40,7 +40,7 @@ from app.main.validators import (
     DoesNotStartWithDoubleZero,
     LettersNumbersAndFullStopsOnly,
     NoCommasInPlaceHolders,
-    OnlyGSMCharacters,
+    OnlySMSCharacters,
     ValidEmail,
     ValidGovEmail,
 )
@@ -639,7 +639,7 @@ class BaseTemplateForm(StripWhitespaceForm):
 
 class SMSTemplateForm(BaseTemplateForm):
     def validate_template_content(self, field):
-        OnlyGSMCharacters()(None, field)
+        OnlySMSCharacters()(None, field)
 
 
 class EmailTemplateForm(BaseTemplateForm):
diff --git a/app/main/validators.py b/app/main/validators.py
index 216038726..b7dfb25a7 100644
--- a/app/main/validators.py
+++ b/app/main/validators.py
@@ -5,7 +5,7 @@ from notifications_utils.recipients import (
     InvalidEmailError,
     validate_email_address,
 )
-from notifications_utils.sanitise_text import SanitiseGSM
+from notifications_utils.sanitise_text import SanitiseSMS
 from wtforms import ValidationError
 from wtforms.validators import Email
 
@@ -79,14 +79,14 @@ class NoCommasInPlaceHolders:
             raise ValidationError(self.message)
 
 
-class OnlyGSMCharacters:
+class OnlySMSCharacters:
     def __call__(self, form, field):
-        non_gsm_characters = sorted(list(SanitiseGSM.get_non_compatible_characters(field.data)))
-        if non_gsm_characters:
+        non_sms_characters = sorted(list(SanitiseSMS.get_non_compatible_characters(field.data)))
+        if non_sms_characters:
             raise ValidationError(
                 'You can’t use {} in text messages. {} won’t show up properly on everyone’s phones.'.format(
-                    formatted_list(non_gsm_characters, conjunction='or', before_each='', after_each=''),
-                    ('It' if len(non_gsm_characters) == 1 else 'They')
+                    formatted_list(non_sms_characters, conjunction='or', before_each='', after_each=''),
+                    ('It' if len(non_sms_characters) == 1 else 'They')
                 )
             )
 
diff --git a/app/main/views/conversation.py b/app/main/views/conversation.py
index e9d5dfeb6..e3ef576df 100644
--- a/app/main/views/conversation.py
+++ b/app/main/views/conversation.py
@@ -127,7 +127,7 @@ def get_sms_thread(service_id, user_number):
                     )
                 },
                 notification.get('personalisation'),
-                downgrade_non_gsm_characters=(not is_inbound),
+                downgrade_non_sms_characters=(not is_inbound),
                 redact_missing_personalisation=redact_personalisation,
             ),
             'created_at': notification['created_at'],
diff --git a/app/templates/views/pricing.html b/app/templates/views/pricing.html
index e54df2e7d..68073cc7b 100644
--- a/app/templates/views/pricing.html
+++ b/app/templates/views/pricing.html
@@ -40,10 +40,10 @@
     <p>See <a href="#paying">how to pay</a>.
 
     <h3 class="heading-small">Long text messages</h3>
-    <p>If a text message is beyond a certain length, it’ll be charged as more than one message:</p>
+    <p>If a text message is longer than 160 characters (including spaces), it’ll be charged as more than one message:</p>
     <div class="bottom-gutter-3-2">
       {% call mapping_table(
-        caption='Letter pricing',
+        caption='Text message pricing',
         field_headings=['Message length', 'Charge'],
         field_headings_visible=True,
         caption_visible=False
@@ -61,6 +61,29 @@
         {% endfor %}
       {% endcall %}
     </div>
+    <h3 class="heading-small">Text messages containing Welsh characters</h3>
+    <p>Long text messages containing Welsh characters (Â, â, Ê, ê, Î, î, Ô, ô, Û, û, Ŵ, ŵ, Ŷ, and ŷ) are charged differently:</p>
+    <div class="bottom-gutter-3-2">
+      {% call mapping_table(
+        caption='Text message pricing',
+        field_headings=['Message length', 'Charge'],
+        field_headings_visible=True,
+        caption_visible=False
+      ) %}
+        {% for message_length, charge in [
+          ('Up to 70 characters', '1 text message'),
+          ('Up to 134 characters', '2 text messages'),
+          ('Up to 201 characters', '3 text messages'),
+          ('Up to 268 characters', '4 text messages'),
+          ('Each additional 67 characters', '1 additional text message'),
+        ] %}
+          {% call row() %}
+            {{ text_field(message_length) }}
+            {{ text_field(charge) }}
+          {% endcall %}
+        {% endfor %}
+      {% endcall %}
+    </div>
     <h3 class="heading-small">Sending text messages to international numbers</h3>
     <p>It might cost more to send text messages to international numbers than UK ones, depending on the country.</p>
     <details>
diff --git a/requirements-app.txt b/requirements-app.txt
index 343b87a89..ee9fa1966 100644
--- a/requirements-app.txt
+++ b/requirements-app.txt
@@ -23,4 +23,4 @@ awscli-cwlogs>=1.4,<1.5
 # Putting upgrade on hold due to v1.0.0 using sha512 instead of sha1 by default
 itsdangerous==0.24  # pyup: <1.0.0
 
-git+https://github.com/alphagov/notifications-utils.git@31.2.6#egg=notifications-utils==31.2.6
+git+https://github.com/alphagov/notifications-utils.git@32.0.0#egg=notifications-utils==32.0.0
diff --git a/requirements.txt b/requirements.txt
index 178f9d16f..4c63dd55e 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -25,7 +25,7 @@ awscli-cwlogs>=1.4,<1.5
 # Putting upgrade on hold due to v1.0.0 using sha512 instead of sha1 by default
 itsdangerous==0.24  # pyup: <1.0.0
 
-git+https://github.com/alphagov/notifications-utils.git@31.2.6#egg=notifications-utils==31.2.6
+git+https://github.com/alphagov/notifications-utils.git@32.0.0#egg=notifications-utils==32.0.0
 
 ## The following requirements were added by pip freeze:
 awscli==1.16.155
diff --git a/tests/app/main/test_validators.py b/tests/app/main/test_validators.py
index b243ccf83..7d96004cb 100644
--- a/tests/app/main/test_validators.py
+++ b/tests/app/main/test_validators.py
@@ -6,7 +6,7 @@ from wtforms import ValidationError
 from app.main.forms import RegisterUserForm, ServiceSmsSenderForm
 from app.main.validators import (
     NoCommasInPlaceHolders,
-    OnlyGSMCharacters,
+    OnlySMSCharacters,
     ValidGovEmail,
 )
 
@@ -165,8 +165,8 @@ def test_for_commas_in_placeholders(
 
 
 @pytest.mark.parametrize('msg', ['The quick brown fox', 'Thé “quick” bröwn fox\u200B'])
-def test_gsm_character_validation(client, msg):
-    OnlyGSMCharacters()(None, _gen_mock_field(msg))
+def test_sms_character_validation(client, msg):
+    OnlySMSCharacters()(None, _gen_mock_field(msg))
 
 
 @pytest.mark.parametrize('data, err_msg', [
@@ -185,9 +185,9 @@ def test_gsm_character_validation(client, msg):
         )
     ),
 ])
-def test_non_gsm_character_validation(data, err_msg, client):
+def test_non_sms_character_validation(data, err_msg, client):
     with pytest.raises(ValidationError) as error:
-        OnlyGSMCharacters()(None, _gen_mock_field(data))
+        OnlySMSCharacters()(None, _gen_mock_field(data))
 
     assert str(error.value) == err_msg