diff --git a/app/main/views/service_settings.py b/app/main/views/service_settings.py
index effcea000..1210e0000 100644
--- a/app/main/views/service_settings.py
+++ b/app/main/views/service_settings.py
@@ -536,6 +536,15 @@ def service_set_letters(service_id):
     )
 
 
+@main.route("/services/<service_id>/service-settings/set-auth-type", methods=['GET'])
+@login_required
+@user_has_permissions('manage_settings', admin_override=True)
+def service_set_auth_type(service_id):
+    return render_template(
+        'views/service-settings/set-auth-type.html',
+    )
+
+
 @main.route("/services/<service_id>/service-settings/letter-contacts", methods=['GET'])
 @login_required
 @user_has_permissions('manage_settings', admin_override=True)
diff --git a/app/templates/views/service-settings.html b/app/templates/views/service-settings.html
index 07439ba83..02711a021 100644
--- a/app/templates/views/service-settings.html
+++ b/app/templates/views/service-settings.html
@@ -26,6 +26,16 @@
           {{ edit_field('Change', url_for('.service_name_change', service_id=current_service.id)) }}
         {% endcall %}
 
+        {% call row() %}
+          {{ text_field('Sign-in method') }}
+          {{ text_field(
+            'Email link or text message code'
+            if 'email_auth' in current_service.permissions
+            else 'Text message code'
+          ) }}
+          {{ edit_field('Change', url_for('.service_set_auth_type', service_id=current_service.id)) }}
+        {% endcall %}
+
       {% endcall %}
 
       {% call mapping_table(
diff --git a/app/templates/views/service-settings/set-auth-type.html b/app/templates/views/service-settings/set-auth-type.html
new file mode 100644
index 000000000..338c027e2
--- /dev/null
+++ b/app/templates/views/service-settings/set-auth-type.html
@@ -0,0 +1,44 @@
+{% extends "withnav_template.html" %}
+{% from "components/textbox.html" import textbox %}
+{% from "components/page-footer.html" import page_footer %}
+
+{% block service_page_title %}
+  Text message sender
+{% endblock %}
+
+{% block maincolumn_content %}
+
+  <div class="grid-row">
+    <div class="column-five-sixths">
+      <h1 class="heading-large">Sign-in method</h1>
+      {% if 'email_auth' in current_service.permissions %}
+        <p class="heading-small bottom-gutter-2-3">
+          Email link or text message code
+        </p>
+        <p>
+          Your team members can sign in with either a text message code
+          or an email link.
+        </p>
+        <p>
+          You can <a href="{{ url_for('.manage_users', service_id=current_service.id) }}">set the sign-in method for individual team members</a>.
+        </p>
+      {% else %}
+        <p class="heading-small bottom-gutter-2-3">
+          Text message code
+        </p>
+        <p>
+          Your team members sign in with a text message code.
+        </p>
+        <p>
+          If signing in with a text message is a problem for your team,
+          please <a href="{{ url_for('.support') }}">contact us</a>.
+        </p>
+      {% endif %}
+      {{ page_footer(
+        back_link=url_for('.service_settings', service_id=current_service.id),
+        back_link_text='Back to settings'
+      ) }}
+    </div>
+  </div>
+
+{% endblock %}
diff --git a/tests/app/main/views/test_service_settings.py b/tests/app/main/views/test_service_settings.py
index d2a9d45c8..b21f766aa 100644
--- a/tests/app/main/views/test_service_settings.py
+++ b/tests/app/main/views/test_service_settings.py
@@ -46,6 +46,7 @@ def mock_get_service_settings_page_common(
 
         'Label Value Action',
         'Service name service one Change',
+        'Sign-in method Text message code Change',
 
         'Label Value Action',
         'Send emails On Change',
@@ -66,6 +67,7 @@ def mock_get_service_settings_page_common(
 
         'Label Value Action',
         'Service name service one Change',
+        'Sign-in method Text message code Change',
 
         'Label Value Action',
         'Send emails On Change',
@@ -122,6 +124,7 @@ def test_should_show_overview(
     (['email', 'sms', 'inbound_sms', 'international_sms'], [
 
         'Service name service one Change',
+        'Sign-in method Text message code Change',
 
         'Label Value Action',
         'Send emails On Change',
@@ -139,9 +142,10 @@ def test_should_show_overview(
         'Send letters Off Change',
 
     ]),
-    (['email', 'sms'], [
+    (['email', 'sms', 'email_auth'], [
 
         'Service name service one Change',
+        'Sign-in method Email link or text message code Change',
 
         'Label Value Action',
         'Send emails On Change',
@@ -249,7 +253,7 @@ def test_letter_contact_block_shows_none_if_not_set(
     ))
 
     page = BeautifulSoup(response.data.decode('utf-8'), 'html.parser')
-    div = page.find_all('tr')[8].find_all('td')[1].div
+    div = page.find_all('tr')[9].find_all('td')[1].div
     assert div.text.strip() == 'Not set'
     assert 'default' in div.attrs['class'][0]
 
@@ -269,7 +273,7 @@ def test_escapes_letter_contact_block(
     ))
 
     page = BeautifulSoup(response.data.decode('utf-8'), 'html.parser')
-    div = str(page.find_all('tr')[8].find_all('td')[1].div)
+    div = str(page.find_all('tr')[9].find_all('td')[1].div)
     assert 'foo<br/>bar' in div
     assert '<script>' not in div
 
@@ -713,9 +717,9 @@ def test_and_more_hint_appears_on_settings_with_more_than_just_a_single_sender(
             page.select('tbody tr')[index].text
         )
 
-    assert get_row(page, 2) == "Email reply to addresses test@example.com …and 2 more Manage"
-    assert get_row(page, 4) == "Text message sender Example …and 2 more Manage"
-    assert get_row(page, 9) == "Sender addresses 1 Example Street …and 2 more Manage"
+    assert get_row(page, 3) == "Email reply to addresses test@example.com …and 2 more Manage"
+    assert get_row(page, 5) == "Text message sender Example …and 2 more Manage"
+    assert get_row(page, 10) == "Sender addresses 1 Example Street …and 2 more Manage"
 
 
 @pytest.mark.parametrize('sender_list_page, expected_output', [
@@ -2003,6 +2007,20 @@ def test_cant_resume_active_service(
             'Your service can receive text messages sent to 0781239871.'
         )
     ),
+    (
+        'main.service_set_auth_type',
+        [],
+        (
+            'Text message code'
+        )
+    ),
+    (
+        'main.service_set_auth_type',
+        ['email_auth'],
+        (
+            'Email link or text message code'
+        )
+    ),
 ])
 def test_invitation_pages(
     logged_in_client,