diff --git a/app/assets/stylesheets/local/_typography.scss b/app/assets/stylesheets/local/_typography.scss
index 401562515..2e85bf969 100644
--- a/app/assets/stylesheets/local/_typography.scss
+++ b/app/assets/stylesheets/local/_typography.scss
@@ -60,3 +60,9 @@
 .destructive-link--no-visited-state {
   @include destructive-link-style-no-visited-state;
 }
+
+// Font override classes
+.extended-gsm-characters {
+  font-family: $govuk-font-family-tabular;
+  letter-spacing: 0.5em;
+}
diff --git a/app/templates/views/pricing/index.html b/app/templates/views/pricing/index.html
index 9fda8ec48..08cb6ce8e 100644
--- a/app/templates/views/pricing/index.html
+++ b/app/templates/views/pricing/index.html
@@ -43,7 +43,12 @@
   <p class="govuk-body">See <a class="govuk-link govuk-link--no-visited-state" href="{{ url_for('main.how_to_pay') }}">how to pay</a>.
 
   <h3 class="heading-small" id="long-text-messages">Long text messages</h3>
-  <p class="govuk-body">If a text message is longer than 160 characters (including spaces), it’ll be charged as more than one message:</p>
+  <p class="govuk-body">If a text message is longer than 160 characters (including spaces), it’ll be charged as more than one message.</p>
+  <p class="govuk-body">
+    The following characters are charged as 2 characters each:<br />
+    <span class="extended-gsm-characters">[]{}^\|~€</span>
+  </p>
+
   <div class="bottom-gutter-3-2">
     {% call mapping_table(
       caption='Text message pricing',