diff --git a/externals/twilio-php b/externals/twilio-php
new file mode 160000
--- /dev/null
+++ b/externals/twilio-php
@@ -0,0 +1 @@
+Subproject commit 389e07ee41eabc422ea88b805006bccac7de9eb3
diff --git a/src/infrastructure/sms/adapter/PhabricatorSMSImplementationAdapter.php b/src/infrastructure/sms/adapter/PhabricatorSMSImplementationAdapter.php
new file mode 100644
--- /dev/null
+++ b/src/infrastructure/sms/adapter/PhabricatorSMSImplementationAdapter.php
@@ -0,0 +1,63 @@
+<?php
+
+abstract class PhabricatorSMSImplementationAdapter {
+
+  private $fromNumber;
+  private $toNumber;
+  private $body;
+
+  public function setFrom($number) {
+    $this->fromNumber = $number;
+    return $this;
+  }
+
+  public function getFrom() {
+    return $this->fromNumber;
+  }
+
+  public function setTo($number) {
+    $this->toNumber = $number;
+    return $this;
+  }
+
+  public function getTo() {
+    return $this->toNumber;
+  }
+
+  public function setBody($body) {
+    $this->body = $body;
+    return $this;
+  }
+
+  public function getBody() {
+    return $this->body;
+  }
+
+  /**
+   * Send the message. Generally, this means connecting to some service and
+   * handing data to it.
+   *
+   * If the adapter determines that the SMS will never be deliverable, it
+   * should throw an exception.
+   *
+   * For temporary failures, throw some other exception or return `false`.
+   *
+   * @return bool True on success.
+   */
+  abstract public function send();
+
+  /**
+   * Convenience function to handling sending an SMS.
+   */
+  public static function sendSMS(array $to_numbers, $body) {
+    $adapter = PhabricatorEnv::getEnvConfig('sms.default-adapter');
+    $from_number = PhabricatorEnv::getEnvConfig('sms.default-sender');
+    PhabricatorWorker::scheduleTask(
+      'PhabricatorSMSDemultiplexer',
+      array(
+        'fromNumber' => $from_number,
+        'toNumbers'  => $to_numbers,
+        'body'       => $body,
+        'adapter'    => $adapter));
+  }
+}
diff --git a/src/infrastructure/sms/adapter/PhabricatorSMSImplementationTwilioAdapter.php b/src/infrastructure/sms/adapter/PhabricatorSMSImplementationTwilioAdapter.php
new file mode 100644
--- /dev/null
+++ b/src/infrastructure/sms/adapter/PhabricatorSMSImplementationTwilioAdapter.php
@@ -0,0 +1,20 @@
+<?php
+
+final class PhabricatorSMSImplementationTwilioAdapter
+  extends PhabricatorSMSImplementationAdapter {
+
+  /**
+   * @phutil-external-symbol class Services_Twilio
+   */
+  public function send() {
+    $account_sid = PhabricatorEnv::getEnvConfig('twilio.account-sid');
+    $auth_token = PhabricatorEnv::getEnvConfig('twilio.auth-token');
+
+    $client = new Services_Twilio($account_sid, $auth_token);
+
+    $client->account->sms_messages->create(array(
+      'From' => $this->getFrom(),
+      'To' => $this->getTo(),
+      'Body' => $this->getBody()));
+  }
+}
diff --git a/src/infrastructure/sms/storage/PhabricatorSMS.php b/src/infrastructure/sms/storage/PhabricatorSMS.php
new file mode 100644
--- /dev/null
+++ b/src/infrastructure/sms/storage/PhabricatorSMS.php
@@ -0,0 +1,17 @@
+<?php
+
+final class PhabricatorSMS
+  extends PhabricatorLiskDAO {
+
+  const STATUS_UNSENT             = 'unsent';
+  const STATUS_SENT               = 'sent';
+  const STATUS_FAILED             = 'failed';
+  const STATUS_FAILED_PERMANENTLY = 'permafailed';
+
+  protected $toNumber;
+  protected $fromNumber;
+  protected $body;
+  protected $sendStatus;
+  protected $sendCount;
+
+}
diff --git a/src/infrastructure/sms/worker/PhabricatorSMSDemultiplexWorker.php b/src/infrastructure/sms/worker/PhabricatorSMSDemultiplexWorker.php
new file mode 100644
--- /dev/null
+++ b/src/infrastructure/sms/worker/PhabricatorSMSDemultiplexWorker.php
@@ -0,0 +1,28 @@
+<?php
+
+final class PhabricatorSMSDemultiplexWorker
+  extends PhabricatorSMSWorker {
+
+  public function doWork() {
+    $viewer = PhabricatorUser::getOmnipotentUser();
+
+    $task_data = $this->getTaskData();
+
+    $to_numbers = idx($task_data, 'toNumbers');
+    if (!$to_numbers) {
+      // If we don't have any to numbers, don't send any sms.
+      return;
+    }
+
+    foreach ($to_numbers as $number) {
+      $this->queueTask(
+        'PhabricatorSMSSendWorker',
+        array(
+          'fromNumber' => $task_data['from_number'],
+          'toNumber' => $number,
+          'body' => $task_data['body'],
+          'adapter' => $task_data['adapter']));
+    }
+  }
+
+}
diff --git a/src/infrastructure/sms/worker/PhabricatorSMSSendWorker.php b/src/infrastructure/sms/worker/PhabricatorSMSSendWorker.php
new file mode 100644
--- /dev/null
+++ b/src/infrastructure/sms/worker/PhabricatorSMSSendWorker.php
@@ -0,0 +1,18 @@
+<?php
+
+final class PhabricatorSMSSendWorker
+  extends PhabricatorSMSWorker {
+
+  public function doWork() {
+    $viewer = PhabricatorUser::getOmnipotentUser();
+
+    $task_data = $this->getTaskData();
+
+    $adapter = newv($task_data['adapter'], array());
+    $adapter->setTo($task_data['toNumber']);
+    $adapter->setFrom($task_data['fromNumber']);
+    $adapter->setBody($task_data['body']);
+    $adapter->send();
+  }
+
+}
diff --git a/src/infrastructure/sms/worker/PhabricatorSMSWorker.php b/src/infrastructure/sms/worker/PhabricatorSMSWorker.php
new file mode 100644
--- /dev/null
+++ b/src/infrastructure/sms/worker/PhabricatorSMSWorker.php
@@ -0,0 +1,11 @@
+<?php
+
+abstract class PhabricatorSMSWorker
+  extends PhabricatorWorker {
+
+  public function renderForDisplay(PhabricatorUser $viewer) {
+    // This data has some sensitive stuff, so don't show it.
+    return null;
+  }
+
+}