diff --git a/res/values/strings.xml b/res/values/strings.xml
index 8e92006..47d066b 100644
--- a/res/values/strings.xml
+++ b/res/values/strings.xml
@@ -379,6 +379,10 @@
     <string name="roaming_reenable_message">You\'ve lost data connectivity because you left your home network with data roaming turned off.</string>
     <!-- Mobile network settings screen, dialog message when user selects the Data roaming check box -->
     <string name="roaming_warning">Allow data roaming? You may incur significant roaming charges!</string>
+
+    <!-- USSD aggregation dialog box: separator strings between messages (new-lines will be added before and after) -->
+    <string name="ussd_dialog_sep" translatable="false">----------</string>
+
     <string name="gsm_umts_options">GSM/UMTS Options</string>
     <string name="cdma_options">CDMA Options</string>
 
diff --git a/src/com/android/phone/PhoneUtils.java b/src/com/android/phone/PhoneUtils.java
index 02df7fd..079f96e 100644
--- a/src/com/android/phone/PhoneUtils.java
+++ b/src/com/android/phone/PhoneUtils.java
@@ -136,6 +136,10 @@
         }
     }
 
+    /** USSD information used to aggregate all USSD messages */
+    private static AlertDialog sUssdDialog = null;
+    private static StringBuilder sUssdMsg = new StringBuilder();
+
     /**
      * Handler that tracks the connections and updates the value of the
      * Mute settings for each connection as needed.
@@ -1100,18 +1104,33 @@
                 // displaying system alert dialog on the screen instead of
                 // using another activity to display the message.  This
                 // places the message at the forefront of the UI.
-                AlertDialog newDialog = new AlertDialog.Builder(context)
-                        .setMessage(text)
-                        .setPositiveButton(R.string.ok, null)
-                        .setCancelable(true)
-                        .create();
 
-                newDialog.getWindow().setType(
-                        WindowManager.LayoutParams.TYPE_SYSTEM_DIALOG);
-                newDialog.getWindow().addFlags(
-                        WindowManager.LayoutParams.FLAG_DIM_BEHIND);
+                if (sUssdDialog == null) {
+                    sUssdDialog = new AlertDialog.Builder(context)
+                            .setPositiveButton(R.string.ok, null)
+                            .setCancelable(true)
+                            .setOnDismissListener(new DialogInterface.OnDismissListener() {
+                                @Override
+                                public void onDismiss(DialogInterface dialog) {
+                                    sUssdMsg.setLength(0);
+                                }
+                            })
+                            .create();
 
-                newDialog.show();
+                    sUssdDialog.getWindow().setType(
+                            WindowManager.LayoutParams.TYPE_SYSTEM_DIALOG);
+                    sUssdDialog.getWindow().addFlags(
+                            WindowManager.LayoutParams.FLAG_DIM_BEHIND);
+                }
+                if (sUssdMsg.length() != 0) {
+                    sUssdMsg
+                            .insert(0, "\n")
+                            .insert(0, app.getResources().getString(R.string.ussd_dialog_sep))
+                            .insert(0, "\n");
+                }
+                sUssdMsg.insert(0, text);
+                sUssdDialog.setMessage(sUssdMsg.toString());
+                sUssdDialog.show();
             } else {
                 if (DBG) log("USSD code has requested user input. Constructing input dialog.");