diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index 5342f5e..4f9dbfb 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -510,6 +510,14 @@
                 android:launchMode="singleInstance"
                 android:theme="@style/Empty">
         </activity>
+
+        <activity android:name="MMIDialogActivity"
+                android:configChanges="orientation|screenSize|keyboardHidden"
+                android:excludeFromRecents="true"
+                android:launchMode="singleInstance"
+                android:theme="@style/Empty">
+        </activity>
+
         <activity android:name=".TextMessagePackageChooser"
                 android:label="@string/respond_via_sms_setting_title"
                 android:configChanges="orientation|screenSize|keyboardHidden"
diff --git a/src/com/android/phone/CallController.java b/src/com/android/phone/CallController.java
index 52dbf76..0519280 100644
--- a/src/com/android/phone/CallController.java
+++ b/src/com/android/phone/CallController.java
@@ -23,9 +23,7 @@
 import com.android.phone.CallGatewayManager.RawGatewayInfo;
 import com.android.phone.Constants.CallStatusCode;
 import com.android.phone.ErrorDialogActivity;
-import com.android.phone.OtaUtils.CdmaOtaScreenState;
 
-import android.app.AlertDialog;
 import android.content.Intent;
 import android.net.Uri;
 import android.os.Handler;
@@ -34,9 +32,7 @@
 import android.provider.CallLog.Calls;
 import android.telephony.PhoneNumberUtils;
 import android.telephony.ServiceState;
-import android.text.TextUtils;
 import android.util.Log;
-import android.widget.Toast;
 
 /**
  * Phone app module in charge of "call control".
@@ -662,12 +658,11 @@
                 // TODO: Rather than launching a toast from here, it would
                 // be cleaner to just set a pending call status code here,
                 // and then let the InCallScreen display the toast...
-                if (mCM.getState() == PhoneConstants.State.OFFHOOK) {
-                    Toast.makeText(mApp, R.string.incall_status_dialed_mmi, Toast.LENGTH_SHORT)
-                            .show();
-                }
+                final Intent mmiIntent = new Intent(mApp, MMIDialogActivity.class);
+                mmiIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK |
+                        Intent.FLAG_ACTIVITY_EXCLUDE_FROM_RECENTS);
+                mApp.startActivity(mmiIntent);
                 return;
-
             default:
                 Log.wtf(TAG, "handleOutgoingCallError: unexpected status code " + status);
                 // Show a generic "call failed" error.
diff --git a/src/com/android/phone/MMIDialogActivity.java b/src/com/android/phone/MMIDialogActivity.java
new file mode 100644
index 0000000..24179b8
--- /dev/null
+++ b/src/com/android/phone/MMIDialogActivity.java
@@ -0,0 +1,136 @@
+/*
+ * Copyright (C) 2013 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.phone;
+
+import android.app.Activity;
+import android.app.Dialog;
+import android.os.AsyncResult;
+import android.os.Bundle;
+import android.os.Handler;
+import android.os.Message;
+import android.util.Log;
+import android.widget.Toast;
+
+import com.android.internal.telephony.CallManager;
+import com.android.internal.telephony.MmiCode;
+import com.android.internal.telephony.Phone;
+import com.android.internal.telephony.PhoneConstants;
+
+import java.util.List;
+
+/**
+ * Used to display a dialog from within the Telephony service when running an USSD code
+ */
+public class MMIDialogActivity extends Activity {
+    private static final String TAG = MMIDialogActivity.class.getSimpleName();
+
+    private Dialog mMMIDialog;
+
+    private Handler mHandler;
+
+    private CallManager mCM = PhoneGlobals.getInstance().getCallManager();
+    private Phone mPhone = PhoneGlobals.getPhone();
+
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        mHandler = new Handler() {
+                @Override
+                public void handleMessage(Message msg) {
+                    switch (msg.what) {
+                        case PhoneGlobals.MMI_COMPLETE:
+                            onMMIComplete((MmiCode) ((AsyncResult) msg.obj).result);
+                            break;
+                        case PhoneGlobals.MMI_CANCEL:
+                            onMMICancel();
+                            break;
+                    }
+                }
+        };
+        mCM.registerForMmiComplete(mHandler, PhoneGlobals.MMI_COMPLETE, null);
+        if (mCM.getState() == PhoneConstants.State.OFFHOOK) {
+            Toast.makeText(this, R.string.incall_status_dialed_mmi, Toast.LENGTH_SHORT).show();
+        }
+        showMMIDialog();
+    }
+
+    private void showMMIDialog() {
+        final List<? extends MmiCode> codes = mPhone.getPendingMmiCodes();
+        if (codes.size() > 0) {
+            final MmiCode mmiCode = codes.get(0);
+            final Message message = Message.obtain(mHandler, PhoneGlobals.MMI_CANCEL);
+            mMMIDialog = PhoneUtils.displayMMIInitiate(this, mmiCode, message, mMMIDialog);
+        } else {
+            finish();
+        }
+    }
+
+    /**
+     * Handles an MMI_COMPLETE event, which is triggered by telephony
+     */
+    private void onMMIComplete(MmiCode mmiCode) {
+        // Check the code to see if the request is ready to
+        // finish, this includes any MMI state that is not
+        // PENDING.
+
+        // if phone is a CDMA phone display feature code completed message
+        int phoneType = mPhone.getPhoneType();
+        if (phoneType == PhoneConstants.PHONE_TYPE_CDMA) {
+            PhoneUtils.displayMMIComplete(mPhone, this, mmiCode, null, null);
+        } else if (phoneType == PhoneConstants.PHONE_TYPE_GSM) {
+            if (mmiCode.getState() != MmiCode.State.PENDING) {
+                Log.d(TAG, "Got MMI_COMPLETE, finishing dialog activity...");
+                dismissDialogsAndFinish();
+            }
+        }
+    }
+
+    /**
+     * Handles an MMI_CANCEL event, which is triggered by the button
+     * (labeled either "OK" or "Cancel") on the "MMI Started" dialog.
+     * @see PhoneUtils#cancelMmiCode(Phone)
+     */
+    private void onMMICancel() {
+        Log.v(TAG, "onMMICancel()...");
+
+        // First of all, cancel the outstanding MMI code (if possible.)
+        PhoneUtils.cancelMmiCode(mPhone);
+
+        // Regardless of whether the current MMI code was cancelable, the
+        // PhoneApp will get an MMI_COMPLETE event very soon, which will
+        // take us to the MMI Complete dialog (see
+        // PhoneUtils.displayMMIComplete().)
+        //
+        // But until that event comes in, we *don't* want to stay here on
+        // the in-call screen, since we'll be visible in a
+        // partially-constructed state as soon as the "MMI Started" dialog
+        // gets dismissed. So let's forcibly bail out right now.
+        Log.d(TAG, "onMMICancel: finishing InCallScreen...");
+        dismissDialogsAndFinish();
+    }
+
+    private void dismissDialogsAndFinish() {
+        if (mMMIDialog != null) {
+            mMMIDialog.dismiss();
+        }
+        if (mHandler != null) {
+            mCM.unregisterForMmiComplete(mHandler);
+        }
+        finish();
+    }
+}