diff --git a/app/assets/stylesheets/views/history.scss b/app/assets/stylesheets/views/history.scss
index b971a1726..2b31ef45f 100644
--- a/app/assets/stylesheets/views/history.scss
+++ b/app/assets/stylesheets/views/history.scss
@@ -26,4 +26,61 @@ $item-top-padding: $gutter-half;
     color: $secondary-text-colour;
   }
 
+  &-percentage {
+
+    $axis-thickness: 2px;
+    border-bottom: $axis-thickness solid $black;
+    position: relative;
+    margin-bottom: 30px;
+    height: 35px;
+
+    &:before,
+    &:after {
+      content: "";
+      position: absolute;
+      bottom: -6px;
+      left: 0;
+      height: 10px;
+      width: $axis-thickness;
+      background: $black;
+    }
+
+    &:after {
+      left: auto;
+      right: 0;
+    }
+
+    &-marker {
+      $size: 20px;
+      $border-thickness: 7px;
+      $text-width: 100px;
+      display: block;
+      width: $size;
+      height: $size;
+      position: absolute;
+      top: 35px - ($size / 2) - ($border-thickness - ($axis-thickness / 2));
+      margin-left: 0 - ($size / 2) - $border-thickness;
+      background: $black;
+      border-radius: $size;
+      border: $border-thickness solid $white;
+    }
+
+    &-left-label,
+    &-right-label {
+      width: 100%;
+      position: absolute;
+      top: 0;
+    }
+
+    &-left-label {
+      left: 0;
+    }
+
+    &-right-label {
+      right: 0;
+      text-align: right;
+    }
+
+  }
+
 }
diff --git a/app/main/views/providers.py b/app/main/views/providers.py
index 003f054ff..eecbf2176 100644
--- a/app/main/views/providers.py
+++ b/app/main/views/providers.py
@@ -1,11 +1,17 @@
-from flask import render_template, url_for
+from collections import defaultdict
+from datetime import datetime
+from operator import itemgetter
+
+from flask import abort, render_template, url_for
 from werkzeug.utils import redirect
 
-from app import provider_client
+from app import format_date_numeric, provider_client
 from app.main import main
 from app.main.forms import ProviderForm
 from app.utils import user_is_platform_admin
 
+PROVIDER_PRIORITY_MEANING_SWITCHOVER = datetime(2019, 11, 29, 11, 0)
+
 
 @main.route("/providers")
 @user_is_platform_admin
@@ -51,6 +57,84 @@ def edit_provider(provider_id):
     return render_template('views/providers/edit-provider.html', form=form, provider=provider)
 
 
+@main.route("/provider/edit-sms-provider-ratio", methods=['GET', 'POST'])
+@user_is_platform_admin
+def edit_sms_provider_ratio():
+
+    providers = sorted([
+        provider
+        for provider in provider_client.get_all_providers()['provider_details']
+        if provider['notification_type'] == 'sms'
+    ], key=itemgetter('identifier'), reverse=True)
+
+    if len(providers) < 2:
+        abort(400)
+
+    return render_template(
+        'views/providers/edit-sms-provider-ratio.html',
+        versions=_chunk_versions_by_day(_get_versions(providers[0], providers[1])),
+    )
+
+
+def _get_versions(provider0, provider1):
+
+    versions = sorted((
+        provider_client.get_provider_versions(provider0['id'])['data'] +
+        provider_client.get_provider_versions(provider1['id'])['data']
+    ), key=lambda version: version['updated_at'] or '', reverse=True)
+
+    for index, version in enumerate(versions):
+
+        previous_version = get_previous_version(
+            versions,
+            index,
+            version['identifier'],
+        )
+
+        if (
+            (version['updated_at'] or '0') < str(PROVIDER_PRIORITY_MEANING_SWITCHOVER)
+        ):
+            version['priority'], previous_version['priority'] = (
+                int(version['priority'] > previous_version['priority']),
+                int(version['priority'] <= previous_version['priority'])
+            )
+
+        if version['identifier'] == provider0['identifier']:
+            fresh_version = version.copy()
+            fresh_version['other_provider'] = previous_version.copy()
+            yield fresh_version
+        elif previous_version['identifier'] in {provider0['identifier'], None}:
+            fresh_version = previous_version.copy()
+            fresh_version['other_provider'] = version.copy()
+            yield fresh_version
+
+
+def get_previous_version(versions, start_index, current_provider_identifier):
+    for index, version in enumerate(versions):
+        if index < start_index:
+            continue
+        if current_provider_identifier == version['identifier']:
+            continue
+        return version
+    return {
+        'identifier': None,
+        'priority': 999,
+        'updated_at': None,
+    }
+
+
+def _chunk_versions_by_day(versions):
+
+    days = defaultdict(list)
+
+    for version in sorted(versions, key=lambda version: version['updated_at'] or '', reverse=True):
+        days[
+            format_date_numeric(version['updated_at']) if version['updated_at'] else ''
+        ].append(version)
+
+    return sorted(days.items(), reverse=True)
+
+
 @main.route("/provider/<uuid:provider_id>")
 @user_is_platform_admin
 def view_provider(provider_id):
diff --git a/app/navigation.py b/app/navigation.py
index 018c903e4..4e9cdef8c 100644
--- a/app/navigation.py
+++ b/app/navigation.py
@@ -89,6 +89,7 @@ class HeaderNavigation(Navigation):
             'clear_cache',
             'create_email_branding',
             'create_letter_branding',
+            'edit_sms_provider_ratio',
             'email_branding',
             'find_services_by_name',
             'find_users_by_email',
@@ -497,6 +498,7 @@ class MainNavigation(Navigation):
         'edit_organisation_name',
         'edit_organisation_type',
         'edit_provider',
+        'edit_sms_provider_ratio',
         'edit_user_org_permissions',
         'email_branding',
         'email_not_received',
@@ -717,6 +719,7 @@ class CaseworkNavigation(Navigation):
         'edit_organisation_name',
         'edit_organisation_type',
         'edit_provider',
+        'edit_sms_provider_ratio',
         'edit_service_template',
         'edit_template_postage',
         'edit_user_email',
@@ -1002,6 +1005,7 @@ class OrgNavigation(Navigation):
         'edit_data_retention',
         'edit_provider',
         'edit_service_template',
+        'edit_sms_provider_ratio',
         'edit_template_postage',
         'edit_user_email',
         'edit_user_mobile_number',
diff --git a/app/templates/views/providers/edit-sms-provider-ratio.html b/app/templates/views/providers/edit-sms-provider-ratio.html
new file mode 100644
index 000000000..2527ba733
--- /dev/null
+++ b/app/templates/views/providers/edit-sms-provider-ratio.html
@@ -0,0 +1,61 @@
+{% extends "views/platform-admin/_base_template.html" %}
+{% from "components/textbox.html" import textbox %}
+{% from "components/page-header.html" import page_header %}
+{% from "components/page-footer.html" import page_footer %}
+{% from "components/form.html" import form_wrapper %}
+
+{% block per_page_title %}
+  Text message providers
+{% endblock %}
+
+{% block platform_admin_content %}
+
+  {{ page_header('Text message providers') }}
+
+  {% call form_wrapper() %}
+  {% endcall %}
+
+
+  {% for day, versions in versions %}
+    <h2 class="heading-small top-gutter">
+      {% if day %}
+        {{ day|format_date_human|title }}
+      {% else %}
+        Start
+      {% endif %}
+    </h2>
+    <ul class="bottom-gutter">
+      {% for version in versions %}
+        <li class="history-list-item">
+          <div class="grid-row">
+            <div class="column-one-third">
+              <div class="history-list-user">
+                {{ version.created_by.name or ('&nbsp;'|safe) }}
+              </div>
+              {% if version.updated_at %}
+                <div class="history-list-time">
+                  {{ version.updated_at|format_time }}
+                </div>
+              {% endif %}
+            </div>
+            <div class="column-two-thirds">
+              {% set percentage = (version.priority / (version.priority + version.other_provider.priority) * 100) %}
+              <div class="history-list-percentage">
+                <div class="history-list-percentage-left-label">
+                  {{ version.display_name }}<br><br>
+                  {{ percentage|format_thousands }}%
+                </div>
+                <div class="history-list-percentage-right-label">
+                  {{ version.other_provider.display_name }}<br><br>
+                  {{ (100 - percentage)|format_thousands }}%
+                </div>
+                <div class="history-list-percentage-marker" style="left: {{ (100 -percentage)|format_thousands }}%"></div>
+              </div>
+            </div>
+          </div>
+        </li>
+      {% endfor %}
+    </ul>
+  {% endfor %}
+
+{% endblock %}