Support embedded more key

This is a followup change to Ie10b3e0b.

Change-Id: I1f91d96e32357b83bd0546537d561d638b6ff0c6
diff --git a/java/res/xml/rows_phone.xml b/java/res/xml/rows_phone.xml
index 60296d0..630b24e 100644
--- a/java/res/xml/rows_phone.xml
+++ b/java/res/xml/rows_phone.xml
@@ -63,8 +63,12 @@
     <Row>
         <Key
             latin:keyStyle="numPhoneToSymbolKeyStyle" />
+        <!-- U+0030: "0" DIGIT ZERO -->
         <Key
-            latin:keyStyle="num0KeyStyle" />
+            latin:keyStyle="num0KeyStyle"
+            latin:code="0x0030"
+            latin:keyLabel="0 +"
+            latin:moreKeys="!embeddedMoreKey!,+" />
         <Key
             latin:keyStyle="numSpaceKeyStyle" />
         <Key