diff --git a/app/main/views/user_profile.py b/app/main/views/user_profile.py
index c02256964..478819188 100644
--- a/app/main/views/user_profile.py
+++ b/app/main/views/user_profile.py
@@ -118,22 +118,43 @@ def user_profile_email_confirm(token):
 
 
 @main.route("/user-profile/mobile-number", methods=['GET', 'POST'])
+@main.route(
+    "/user-profile/mobile-number/delete",
+    methods=['GET'],
+    endpoint="user_profile_confirm_delete_mobile_number"
+)
 @user_is_logged_in
 def user_profile_mobile_number():
 
+    user = User.from_id(current_user.id)
     form = ChangeMobileNumberForm(mobile_number=current_user.mobile_number)
 
     if form.validate_on_submit():
         session[NEW_MOBILE] = form.mobile_number.data
         return redirect(url_for('.user_profile_mobile_number_authenticate'))
 
+    if (request.endpoint == "main.user_profile_confirm_delete_mobile_number"):
+        flash("Are you sure you want to delete your mobile number from Notify?", 'delete')
+
     return render_template(
         'views/user-profile/change.html',
         thing='mobile number',
-        form_field=form.mobile_number
+        form_field=form.mobile_number,
+        user_auth=user.auth_type
     )
 
 
+@main.route("/user-profile/mobile-number/delete", methods=['POST'])
+@user_is_logged_in
+def user_profile_mobile_number_delete():
+    if current_user.auth_type == 'sms_auth':
+        abort(403)
+
+    current_user.update(mobile_number=None)
+
+    return redirect(url_for('.user_profile'))
+
+
 @main.route("/user-profile/mobile-number/authenticate", methods=['GET', 'POST'])
 @user_is_logged_in
 def user_profile_mobile_number_authenticate():
diff --git a/app/templates/views/user-profile/change.html b/app/templates/views/user-profile/change.html
index ae8a54a13..c7ffa8b51 100644
--- a/app/templates/views/user-profile/change.html
+++ b/app/templates/views/user-profile/change.html
@@ -20,9 +20,20 @@
     <div class="govuk-grid-column-three-quarters">
       {% call form_wrapper() %}
         {{ form_field(error_message_with_html=True) }}
-        {{ page_footer('Save') }}
+        {% if current_user.auth_type == 'email_auth' %}
+          {{ page_footer(
+            'Save',
+            delete_link=url_for(
+              'main.user_profile_mobile_number_delete',
+              user_id=current_user.id
+            ),
+            delete_link_text='Delete your number'
+            )
+          }}
+        {% else %}
+          {{ page_footer('Save')}}
+        {% endif %}
       {% endcall %}
     </div>
   </div>
-
 {% endblock %}
diff --git a/tests/app/main/views/test_user_profile.py b/tests/app/main/views/test_user_profile.py
index 21866e775..d3688143a 100644
--- a/tests/app/main/views/test_user_profile.py
+++ b/tests/app/main/views/test_user_profile.py
@@ -183,6 +183,59 @@ def test_should_show_mobile_number_page(
 ):
     page = client_request.get(('main.user_profile_mobile_number'))
     assert 'Change your mobile number' in page.text
+    assert 'Delete your number' not in page.text
+
+
+def test_change_your_mobile_number_page_shows_delete_link_if_user_on_email_auth(
+    client_request,
+    api_user_active_email_auth,
+    mocker
+):
+    mocker.patch('app.user_api_client.get_user', return_value=api_user_active_email_auth)
+    page = client_request.get(('main.user_profile_mobile_number'))
+    assert 'Change your mobile number' in page.text
+    assert 'Delete your number' in page.text
+
+
+def test_confirm_delete_mobile_number(
+    client_request,
+    api_user_active_email_auth,
+    mocker
+):
+    mocker.patch('app.user_api_client.get_user', return_value=api_user_active_email_auth)
+
+    page = client_request.get(
+        '.user_profile_confirm_delete_mobile_number',
+        _test_page_title=False,
+    )
+
+    assert normalize_spaces(page.select_one('.banner-dangerous').text) == (
+        'Are you sure you want to delete your mobile number from Notify? '
+        'Yes, delete'
+    )
+    assert 'action' not in page.select_one('.banner-dangerous form')
+    assert page.select_one('.banner-dangerous form')['method'] == 'post'
+
+
+def test_delete_mobile_number(
+    client_request,
+    api_user_active_email_auth,
+    mocker
+):
+    mocker.patch('app.user_api_client.get_user', return_value=api_user_active_email_auth)
+    mock_delete = mocker.patch('app.user_api_client.update_user_attribute')
+
+    client_request.post(
+        '.user_profile_mobile_number_delete',
+        _expected_redirect=url_for(
+            '.user_profile',
+            _external=True,
+        )
+    )
+    mock_delete.assert_called_once_with(
+        api_user_active_email_auth["id"],
+        mobile_number=None
+    )
 
 
 @pytest.mark.parametrize('phone_number_to_register_with', [