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diff --git a/src/com/android/messaging/datamodel/action/DeleteConversationAction.java b/src/com/android/messaging/datamodel/action/DeleteConversationAction.java
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+++ b/src/com/android/messaging/datamodel/action/DeleteConversationAction.java
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+/*
+ * Copyright (C) 2015 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.messaging.datamodel.action;
+
+import android.database.Cursor;
+import android.net.Uri;
+import android.os.Bundle;
+import android.os.Parcel;
+import android.os.Parcelable;
+import android.text.TextUtils;
+
+import com.android.messaging.Factory;
+import com.android.messaging.datamodel.BugleDatabaseOperations;
+import com.android.messaging.datamodel.BugleNotifications;
+import com.android.messaging.datamodel.DataModel;
+import com.android.messaging.datamodel.DataModelException;
+import com.android.messaging.datamodel.DatabaseHelper;
+import com.android.messaging.datamodel.DatabaseHelper.MessageColumns;
+import com.android.messaging.datamodel.DatabaseWrapper;
+import com.android.messaging.datamodel.MessagingContentProvider;
+import com.android.messaging.sms.MmsUtils;
+import com.android.messaging.util.Assert;
+import com.android.messaging.util.LogUtil;
+import com.android.messaging.widget.WidgetConversationProvider;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * Action used to delete a conversation.
+ */
+public class DeleteConversationAction extends Action implements Parcelable {
+    private static final String TAG = LogUtil.BUGLE_DATAMODEL_TAG;
+
+    public static void deleteConversation(final String conversationId, final long cutoffTimestamp) {
+        final DeleteConversationAction action = new DeleteConversationAction(conversationId,
+                cutoffTimestamp);
+        action.start();
+    }
+
+    private static final String KEY_CONVERSATION_ID = "conversation_id";
+    private static final String KEY_CUTOFF_TIMESTAMP = "cutoff_timestamp";
+
+    private DeleteConversationAction(final String conversationId, final long cutoffTimestamp) {
+        super();
+        actionParameters.putString(KEY_CONVERSATION_ID, conversationId);
+        // TODO: Should we set cuttoff timestamp to prevent us deleting new messages?
+        actionParameters.putLong(KEY_CUTOFF_TIMESTAMP, cutoffTimestamp);
+    }
+
+    // Delete conversation from both the local DB and telephony in the background so sync cannot
+    // run concurrently and incorrectly try to recreate the conversation's messages locally. The
+    // telephony database can sometimes be quite slow to delete conversations, so we delete from
+    // the local DB first, notify the UI, and then delete from telephony.
+    @Override
+    protected Bundle doBackgroundWork() throws DataModelException {
+        final DatabaseWrapper db = DataModel.get().getDatabase();
+
+        final String conversationId = actionParameters.getString(KEY_CONVERSATION_ID);
+        final long cutoffTimestamp = actionParameters.getLong(KEY_CUTOFF_TIMESTAMP);
+
+        if (!TextUtils.isEmpty(conversationId)) {
+            // First find the thread id for this conversation.
+            final long threadId = BugleDatabaseOperations.getThreadId(db, conversationId);
+
+            if (BugleDatabaseOperations.deleteConversation(db, conversationId, cutoffTimestamp)) {
+                LogUtil.i(TAG, "DeleteConversationAction: Deleted local conversation "
+                        + conversationId);
+
+                BugleActionToasts.onConversationDeleted();
+
+                // Remove notifications if necessary
+                BugleNotifications.update(true /* silent */, null /* conversationId */,
+                        BugleNotifications.UPDATE_MESSAGES);
+
+                // We have changed the conversation list
+                MessagingContentProvider.notifyConversationListChanged();
+
+                // Notify the widget the conversation is deleted so it can go into its configure state.
+                WidgetConversationProvider.notifyConversationDeleted(
+                        Factory.get().getApplicationContext(),
+                        conversationId);
+            } else {
+                LogUtil.w(TAG, "DeleteConversationAction: Could not delete local conversation "
+                        + conversationId);
+                return null;
+            }
+
+            // Now delete from telephony DB. MmsSmsProvider throws an exception if the thread id is
+            // less than 0. If it's greater than zero, it will delete all messages with that thread
+            // id, even if there's no corresponding row in the threads table.
+            if (threadId >= 0) {
+                final int count = MmsUtils.deleteThread(threadId, cutoffTimestamp);
+                if (count > 0) {
+                    LogUtil.i(TAG, "DeleteConversationAction: Deleted telephony thread "
+                            + threadId + " (cutoffTimestamp = " + cutoffTimestamp + ")");
+                } else {
+                    LogUtil.w(TAG, "DeleteConversationAction: Could not delete thread from "
+                            + "telephony: conversationId = " + conversationId + ", thread id = "
+                            + threadId);
+                }
+            } else {
+                LogUtil.w(TAG, "DeleteConversationAction: Local conversation " + conversationId
+                        + " has an invalid telephony thread id; will delete messages individually");
+                deleteConversationMessagesFromTelephony();
+            }
+        } else {
+            LogUtil.e(TAG, "DeleteConversationAction: conversationId is empty");
+        }
+
+        return null;
+    }
+
+    /**
+     * Deletes all the telephony messages for the local conversation being deleted.
+     * <p>
+     * This is a fallback used when the conversation is not associated with any telephony thread,
+     * or its thread id is invalid (e.g. negative). This is not common, but can happen sometimes
+     * (e.g. the Unknown Sender conversation). In the usual case of deleting a conversation, we
+     * don't need this because the telephony provider automatically deletes messages when a thread
+     * is deleted.
+     */
+    private void deleteConversationMessagesFromTelephony() {
+        final DatabaseWrapper db = DataModel.get().getDatabase();
+        final String conversationId = actionParameters.getString(KEY_CONVERSATION_ID);
+        Assert.notNull(conversationId);
+
+        final List<Uri> messageUris = new ArrayList<>();
+        Cursor cursor = null;
+        try {
+            cursor = db.query(DatabaseHelper.MESSAGES_TABLE,
+                    new String[] { MessageColumns.SMS_MESSAGE_URI },
+                    MessageColumns.CONVERSATION_ID + "=?",
+                    new String[] { conversationId },
+                    null, null, null);
+            while (cursor.moveToNext()) {
+                String messageUri = cursor.getString(0);
+                try {
+                    messageUris.add(Uri.parse(messageUri));
+                } catch (Exception e) {
+                    LogUtil.e(TAG, "DeleteConversationAction: Could not parse message uri "
+                            + messageUri);
+                }
+            }
+        } finally {
+            if (cursor != null) {
+                cursor.close();
+            }
+        }
+        for (Uri messageUri : messageUris) {
+            int count = MmsUtils.deleteMessage(messageUri);
+            if (count > 0) {
+                if (LogUtil.isLoggable(TAG, LogUtil.DEBUG)) {
+                    LogUtil.d(TAG, "DeleteConversationAction: Deleted telephony message "
+                            + messageUri);
+                }
+            } else {
+                LogUtil.w(TAG, "DeleteConversationAction: Could not delete telephony message "
+                        + messageUri);
+            }
+        }
+    }
+
+    @Override
+    protected Object executeAction() {
+        requestBackgroundWork();
+        return null;
+    }
+
+    private DeleteConversationAction(final Parcel in) {
+        super(in);
+    }
+
+    public static final Parcelable.Creator<DeleteConversationAction> CREATOR
+            = new Parcelable.Creator<DeleteConversationAction>() {
+        @Override
+        public DeleteConversationAction createFromParcel(final Parcel in) {
+            return new DeleteConversationAction(in);
+        }
+
+        @Override
+        public DeleteConversationAction[] newArray(final int size) {
+            return new DeleteConversationAction[size];
+        }
+    };
+
+    @Override
+    public void writeToParcel(final Parcel parcel, final int flags) {
+        writeActionToParcel(parcel, flags);
+    }
+}