diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index 9d5aecb..4fb98f5 100755
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -49,6 +49,7 @@
     <uses-permission android:name="android.permission.BLUETOOTH" />
     <!-- add for guest to set system property -->
     <uses-permission android:name="android.permission.INTERACT_ACROSS_USERS" />
+    <uses-permission android:name="android.permission.READ_PHONE_STATE" />
 
     <supports-screens android:smallScreens="false"
             android:normalScreens="true" android:largeScreens="true"