diff --git a/xwords4/android/XWords4/jni/xwjni.c b/xwords4/android/XWords4/jni/xwjni.c
index ad04f5f48..760943121 100644
--- a/xwords4/android/XWords4/jni/xwjni.c
+++ b/xwords4/android/XWords4/jni/xwjni.c
@@ -1,4 +1,4 @@
-/* -*-mode: C; compile-command: "../../scripts/ndkbuild.sh"; -*- */
+/* -*-mode: C; compile-command: "../../scripts/ndkbuild.sh -j3"; -*- */
 /*
  * Copyright © 2009 - 2011 by Eric House (xwords@eehouse.org).  All rights
  * reserved.
@@ -270,6 +270,17 @@ Java_org_eehouse_android_xw4_jni_XwJNI_comms_1getInitialAddr
     setJAddrRec( env, jaddr, &addr );
 }
 
+JNIEXPORT jstring JNICALL
+Java_org_eehouse_android_xw4_jni_XwJNI_comms_1getUUID
+( JNIEnv* env, jclass C )
+{
+    const char* uuid = XW_BT_UUID;
+    XP_LOGF( "uuid: %s", uuid );
+    jstring jstr = (*env)->NewStringUTF( env, uuid );
+    (*env)->DeleteLocalRef( env, jstr );
+    return jstr;
+}
+
 JNIEXPORT jboolean JNICALL
 Java_org_eehouse_android_xw4_jni_XwJNI_dict_1getInfo
 ( JNIEnv* env, jclass C, jbyteArray jDictBytes, jstring jpath, 
diff --git a/xwords4/android/XWords4/src/org/eehouse/android/xw4/XWApp.java b/xwords4/android/XWords4/src/org/eehouse/android/xw4/XWApp.java
index 940a10576..f2d564515 100644
--- a/xwords4/android/XWords4/src/org/eehouse/android/xw4/XWApp.java
+++ b/xwords4/android/XWords4/src/org/eehouse/android/xw4/XWApp.java
@@ -23,8 +23,12 @@ package org.eehouse.android.xw4;
 import android.app.Application;
 import java.util.UUID;
 
+import org.eehouse.android.xw4.jni.XwJNI;
+
 public class XWApp extends Application {
 
+    private static UUID s_UUID = null;
+
     @Override
     public void onCreate()
     {
@@ -41,7 +45,10 @@ public class XWApp extends Application {
     }
 
     public static UUID getAppUUID() {
-        return UUID.fromString( "d0837107-421f-11e1-b86c-0800200c9a66" );
+        if ( null == s_UUID ) {
+            s_UUID = UUID.fromString( XwJNI.comms_getUUID() );
+        }
+        return s_UUID;
     }
 
     public static String getAppName() {
diff --git a/xwords4/android/XWords4/src/org/eehouse/android/xw4/jni/XwJNI.java b/xwords4/android/XWords4/src/org/eehouse/android/xw4/jni/XwJNI.java
index 1ec41769a..dad4e5470 100644
--- a/xwords4/android/XWords4/src/org/eehouse/android/xw4/jni/XwJNI.java
+++ b/xwords4/android/XWords4/src/org/eehouse/android/xw4/jni/XwJNI.java
@@ -50,6 +50,7 @@ public class XwJNI {
     public static native void comms_getInitialAddr( CommsAddrRec addr,
                                                     String relayHost,
                                                     int relayPort );
+    public static native String comms_getUUID();
 
     // Game methods
     public static native int initJNI();
diff --git a/xwords4/common/comms.h b/xwords4/common/comms.h
index 2c07b4128..cafd174f2 100644
--- a/xwords4/common/comms.h
+++ b/xwords4/common/comms.h
@@ -55,11 +55,7 @@ typedef enum {
     , COMMS_RELAYSTATE_ALLCONNECTED
 } CommsRelayState;
 
-
-/* WHAT SHOULD THIS BE?  Copied from Whiteboard....  PENDING */
-#define XW_BT_UUID \
-    { 0x83, 0xe0, 0x87, 0xae, 0x4e, 0x18, 0x46, 0xbe,  \
-      0x83, 0xe0, 0x7b, 0x3d, 0xe6, 0xa1, 0xc3, 0x3b } 
+#define XW_BT_UUID "7be0d084-ff89-4d6d-9c78-594773a6f963"
 
 #define XW_BT_NAME "Crosswords"