diff --git a/java/com/android/dialer/app/DialtactsActivity.java b/java/com/android/dialer/app/DialtactsActivity.java
index 48796db..cc3f81b 100644
--- a/java/com/android/dialer/app/DialtactsActivity.java
+++ b/java/com/android/dialer/app/DialtactsActivity.java
@@ -109,6 +109,7 @@
 import com.android.dialer.dialpadview.DialpadFragment;
 import com.android.dialer.dialpadview.DialpadFragment.DialpadListener;
 import com.android.dialer.dialpadview.DialpadFragment.LastOutgoingCallCallback;
+import com.android.dialer.duo.DuoComponent;
 import com.android.dialer.interactions.PhoneNumberInteraction;
 import com.android.dialer.interactions.PhoneNumberInteraction.InteractionErrorCode;
 import com.android.dialer.logging.DialerImpression;
@@ -836,6 +837,10 @@
             .setActionTextColor(getResources().getColor(R.color.dialer_snackbar_action_text_color))
             .show();
       }
+    } else if (requestCode == ActivityRequestCodes.DIALTACTS_DUO) {
+      // We just returned from starting Duo for a task. Reload our reachability data since it
+      // may have changed after a user finished activating Duo.
+      DuoComponent.get(this).getDuo().reloadReachability(this);
     }
     super.onActivityResult(requestCode, resultCode, data);
   }
diff --git a/java/com/android/dialer/database/DialerDatabaseHelper.java b/java/com/android/dialer/database/DialerDatabaseHelper.java
index 9a25812..113e863 100644
--- a/java/com/android/dialer/database/DialerDatabaseHelper.java
+++ b/java/com/android/dialer/database/DialerDatabaseHelper.java
@@ -26,19 +26,21 @@
 import android.database.sqlite.SQLiteOpenHelper;
 import android.database.sqlite.SQLiteStatement;
 import android.net.Uri;
-import android.os.AsyncTask;
 import android.provider.BaseColumns;
 import android.provider.ContactsContract;
 import android.provider.ContactsContract.CommonDataKinds.Phone;
 import android.provider.ContactsContract.Contacts;
 import android.provider.ContactsContract.Data;
 import android.provider.ContactsContract.Directory;
+import android.support.annotation.Nullable;
 import android.support.annotation.VisibleForTesting;
 import android.support.annotation.WorkerThread;
 import android.text.TextUtils;
 import com.android.contacts.common.R;
 import com.android.contacts.common.util.StopWatch;
 import com.android.dialer.common.LogUtil;
+import com.android.dialer.common.concurrent.DialerExecutor.Worker;
+import com.android.dialer.common.concurrent.DialerExecutorComponent;
 import com.android.dialer.database.FilteredNumberContract.FilteredNumberColumns;
 import com.android.dialer.smartdial.SmartDialNameMatcher;
 import com.android.dialer.smartdial.SmartDialPrefix;
@@ -332,7 +334,11 @@
   /** Starts the database upgrade process in the background. */
   public void startSmartDialUpdateThread() {
     if (PermissionsUtil.hasContactsReadPermissions(mContext)) {
-      new SmartDialUpdateAsyncTask().execute();
+      DialerExecutorComponent.get(mContext)
+          .dialerExecutorFactory()
+          .createNonUiTaskBuilder(new UpdateSmartDialWorker())
+          .build()
+          .executeParallel(null);
     }
   }
 
@@ -1228,10 +1234,11 @@
     }
   }
 
-  private class SmartDialUpdateAsyncTask extends AsyncTask<Object, Object, Object> {
+  private class UpdateSmartDialWorker implements Worker<Void, Void> {
 
+    @Nullable
     @Override
-    protected Object doInBackground(Object... objects) {
+    public Void doInBackground(@Nullable Void input) throws Throwable {
       updateSmartDialDatabase();
       return null;
     }
diff --git a/java/com/android/dialer/duo/Duo.java b/java/com/android/dialer/duo/Duo.java
index 9012dee..5f49e3e 100644
--- a/java/com/android/dialer/duo/Duo.java
+++ b/java/com/android/dialer/duo/Duo.java
@@ -30,6 +30,7 @@
 /** Interface for Duo video call integration. */
 public interface Duo {
 
+  /** @return true if the Duo integration is enabled on this device. */
   boolean isEnabled(@NonNull Context context);
 
   /**
@@ -38,32 +39,53 @@
    */
   boolean isActivated(@NonNull Context context);
 
+  /** @return true if the parameter number is reachable on Duo. */
   @MainThread
   boolean isReachable(@NonNull Context context, @Nullable String number);
 
-  /** @return {@code null} if result is unknown. */
+  /**
+   * @return true if the number supports upgrading a voice call to a Duo video call. Returns {@code
+   *     null} if result is unknown.
+   */
   @MainThread
   Optional<Boolean> supportsUpgrade(@NonNull Context context, @Nullable String number);
 
+  /** Starts a task to update the reachability of the parameter numbers asynchronously. */
   @MainThread
   void updateReachability(@NonNull Context context, @NonNull List<String> numbers);
 
+  /**
+   * Clears the current reachability data and starts a task to load the latest reachability data
+   * asynchronously.
+   */
+  @MainThread
+  void reloadReachability(@NonNull Context context);
+
+  /**
+   * @return an Intent to start a Duo video call with the parameter number. Must be started using
+   *     startActivityForResult.
+   */
   @MainThread
   Intent getIntent(@NonNull Context context, @NonNull String number);
 
+  /** Requests upgrading the parameter ongoing call to a Duo video call. */
   @MainThread
   void requestUpgrade(@NonNull Context context, Call call);
 
+  /** Registers a listener for reachability data changes. */
   @MainThread
   void registerListener(@NonNull DuoListener listener);
 
+  /** Unregisters a listener for reachability data changes. */
   @MainThread
   void unregisterListener(@NonNull DuoListener listener);
 
+  /** The string resource to use for outgoing Duo call entries in call details. */
   @StringRes
   @MainThread
   int getOutgoingCallTypeText();
 
+  /** The string resource to use for incoming Duo call entries in call details. */
   @StringRes
   @MainThread
   int getIncomingCallTypeText();
diff --git a/java/com/android/dialer/duo/stub/DuoStub.java b/java/com/android/dialer/duo/stub/DuoStub.java
index 628d6dc..398e990 100644
--- a/java/com/android/dialer/duo/stub/DuoStub.java
+++ b/java/com/android/dialer/duo/stub/DuoStub.java
@@ -68,6 +68,9 @@
     Assert.isNotNull(numbers);
   }
 
+  @Override
+  public void reloadReachability(@NonNull Context context) {}
+
   @MainThread
   @Override
   public Intent getIntent(@NonNull Context context, @NonNull String number) {