Ditch COMPLETION_FAILED; it didn't make any UI difference

introspection/mm-modem-cdma.xml

 <?xml version="1.0" encoding="UTF-8" ?>
 
 <node name="/" xmlns:tp="http://telepathy.freedesktop.org/wiki/DbusSpec#extensions-v0">
   <interface name="org.freedesktop.ModemManager.Modem.Cdma">
 
     <method name="Activate">
       <tp:docstring>
-        Activates the modem for use with a given carrier.
+        Activates the modem for use with a given carrier.  In the
+        event of immediate failure, returns an error value instead of
+        setting a DBus error.
       </tp:docstring>
       <annotation name="org.freedesktop.DBus.GLib.Async" value=""/>
       <annotation name="org.freedesktop.DBus.GLib.CSymbol" value="impl_modem_cdma_activate"/>
       <arg name="carrier" type="s" direction="in">
         <tp:docstring>
           Name of carrier.
         </tp:docstring>
       </arg>
+      <arg name="immediate_error" type="u" direction="out">
+        <tp:docstring>
+          An enum from MM_MODEM_CDMA_ACTIVATION_ERROR.  This is
+          returned for immediate errors.  Delayed errors are returned
+          via an ActivationStateChanged signal
+        </tp:docstring>
+      </arg>
     </method>
 
     <method name="ActivateManual">
       <tp:docstring>
         Sets modem configuration data.  Unlike regular Activate(),
         this does not contact the carrier.  Some modems will reboot
         after this call is made.
       </tp:docstring>
       <annotation name="org.freedesktop.DBus.GLib.Async" value=""/>
       <annotation name="org.freedesktop.DBus.GLib.CSymbol" value="impl_modem_cdma_activate_manual"/>
       <arg name="properties" type="a{sv}" direction="in">
         <tp:docstring>
           A dictionary of properties to set on the modem.  Keys include 'mdn', 'min'
         </tp:docstring>
       </arg>
     </method>
 
     <method name="ActivateManualDebug">
-      <tp:docstring> 
+      <tp:docstring>
         Workaround for the fact that dbus-send cannot send
         dictionaries of variants.  Calls ActivateManual, with
         system_id converted to int.
       </tp:docstring>
       <annotation name="org.freedesktop.DBus.GLib.Async" value=""/>
       <annotation name="org.freedesktop.DBus.GLib.CSymbol" value="impl_modem_cdma_activate_manual_debug"/>
       <arg name="properties" type="a{ss}" direction="in">
         <tp:docstring>
           Same as ActivateManual
         </tp:docstring>
       </arg>
     </method>
 
+    <signal name="ActivationStateChanged">
+      <tp:docstring>
+            The device activation state changed.
+      </tp:docstring>
+      <arg name="activation_state" type="u" tp:type="MM_MODEM_CDMA_ACTIVATION_STATE">
+        <tp:docstring>Current activation state</tp:docstring>
+      </arg>
+      <arg name="activation_error" type="u" tp:type="MM_MODEM_CDMA_ACTIVATION_ERROR">
+        <tp:docstring>Carrier-specific error code</tp:docstring>
+      </arg>
+      <arg name="status_changes" type="a{sv}">
+        <tp:docstring>Selected Modem.Simple.GetStatus keys that have changed as a
+          result of this activation state change.  Will include 'mdn'
+          and 'min'.
+        </tp:docstring>
+      </arg>
+    </signal>
+
     <method name="GetSignalQuality">
       <tp:docstring>
         Get the current signal quality.
       </tp:docstring>
       <annotation name="org.freedesktop.DBus.GLib.Async" value=""/>
       <annotation name="org.freedesktop.DBus.GLib.CSymbol" value="impl_modem_cdma_get_signal_quality"/>
       <arg name="quality" type="u" direction="out">
         <tp:docstring>
           Signal quality (percent).
         </tp:docstring>
@@ skipping 30 matching lines @@
       <tp:docstring>
         The signal quality changed.
       </tp:docstring>
       <arg name="quality" type="u">
         <tp:docstring>
           The new quality in percent, 0..100.
         </tp:docstring>
       </arg>
     </signal>
 
-    <signal name="ActivationCompleted">
-      <tp:docstring>
-        Send a notification that activation of the modem has completed.
-      </tp:docstring>
-      <arg name="activated" type="b">
-        <tp:docstring>
-          True if succeeded, false if failed.
-        </tp:docstring>
-      </arg>
-    </signal>
-
     <method name="GetRegistrationState">
       <tp:docstring>Get device registration state.</tp:docstring>
       <annotation name="org.freedesktop.DBus.GLib.Async" value=""/>
       <annotation name="org.freedesktop.DBus.GLib.CSymbol" value="impl_modem_cdma_get_registration_state"/>
       <arg name="cdma_1x_state" type="u" direction="out" tp:type="MM_MODEM_CDMA_REGISTRATION_STATE">
         <tp:docstring>CDMA 1x registration state.</tp:docstring>
       </arg>
       <arg name="evdo_state" type="u" direction="out" tp:type="MM_MODEM_CDMA_REGISTRATION_STATE">
         <tp:docstring>EVDO registration state.</tp:docstring>
       </arg>
@@ skipping 39 matching lines @@
       <tp:enumvalue suffix="ACTIVATING" value="1">
         <tp:docstring>Device is activating</tp:docstring>
       </tp:enumvalue>
       <tp:enumvalue suffix="PARTIALLY_ACTIVATED" value="2">
         <tp:docstring>Device is partially activated; carrier-specific steps required to continue.</tp:docstring>
       </tp:enumvalue>
       <tp:enumvalue suffix="ACTIVATED" value="3">
         <tp:docstring>Device is ready for use.</tp:docstring>
       </tp:enumvalue>
     </tp:enum>
+
+    <tp:enum name="MM_MODEM_CDMA_ACTIVATION_ERROR" type="u">
+      <tp:enumvalue suffix="NO_ERROR" value="0"/>
+      <tp:enumvalue suffix="ROAMING" value="1">
+        <tp:docstring>
+          Device cannot activate while roaming.
+        </tp:docstring>
+      </tp:enumvalue>
+      <tp:enumvalue suffix="WRONG_RADIO_INTERFACE" value="2">
+        <tp:docstring>
+          Device cannot activate on this network type (eg EVDO vs 1xRTT).
+        </tp:docstring>
+      </tp:enumvalue>
+      <tp:enumvalue suffix="COULD_NOT_CONNECT" value="3">
+        <tp:docstring>
+          Device could not connect to the network for activation.
+        </tp:docstring>
+      </tp:enumvalue>
+      <tp:enumvalue suffix="SECURITY_AUTHENTICATION_FAILED" value="4">
+        <tp:docstring>
+          Device could not authenticate to the network for activation.
+        </tp:docstring>
+      </tp:enumvalue>
+      <tp:enumvalue suffix="PROVISIONING_FAILED" value="5">
+        <tp:docstring>
+          Later stages of device provisioning failed.
+        </tp:docstring>
+      </tp:enumvalue>
+      <tp:enumvalue suffix="NO_SIGNAL" value="6">
+        <tp:docstring>
+          No signal available.
+        </tp:docstring>
+      </tp:enumvalue>
+      <tp:enumvalue suffix="UNKNOWN" value="7">
+        <tp:docstring>
+          An error occurred.
+        </tp:docstring>
+      </tp:enumvalue>
+      <tp:enumvalue suffix="TIMED_OUT" value="8">
+        <tp:docstring>
+          Activation timed out.
+        </tp:docstring>
+      </tp:enumvalue>
+      <tp:enumvalue suffix="START_FAILED" value="9">
+        <tp:docstring>
+          API call for initial activation failed.
+        </tp:docstring>
+      </tp:enumvalue>
+    </tp:enum>
   </interface>
 </node>
-