diff --git a/introspection/mm-modem-gsm-card.xml b/introspection/mm-modem-gsm-card.xml
index 81cc883e..91b0c00e 100644
--- a/introspection/mm-modem-gsm-card.xml
+++ b/introspection/mm-modem-gsm-card.xml
@@ -34,19 +34,9 @@
       </tp:docstring>
       <annotation name="org.freedesktop.DBus.GLib.Async" value=""/>
       <annotation name="org.freedesktop.DBus.GLib.CSymbol" value="impl_gsm_modem_get_info"/>
-      <arg name="manufacturer" type="s" direction="out">
+      <arg name="info" type="(sss)" direction="out">
 	<tp:docstring>
-	  The manufacturer of the card.
-	</tp:docstring>
-      </arg>
-      <arg name="modem" type="s" direction="out">
-	<tp:docstring>
-	  The model of the card.
-	</tp:docstring>
-      </arg>
-      <arg name="version" type="s" direction="out">
-	<tp:docstring>
-	  The version (revision) of the card.
+	  Structure containing manufacturer, model, and version (revision) of the card.
 	</tp:docstring>
       </arg>
     </method>
diff --git a/introspection/mm-modem-gsm-contacts.xml b/introspection/mm-modem-gsm-contacts.xml
index d1b5dc05..60b06ad4 100644
--- a/introspection/mm-modem-gsm-contacts.xml
+++ b/introspection/mm-modem-gsm-contacts.xml
@@ -49,19 +49,9 @@
 	  The index of the contact.
 	</tp:docstring>
       </arg>
-      <arg name="found_index" type="u" direction="out">
+      <arg name="contact" type="(uss)" direction="out">
 	<tp:docstring>
-	  The index of the contact (same as the passed index).
-	</tp:docstring>
-      </arg>
-      <arg name="name" type="s" direction="out">
-	<tp:docstring>
-	  The name of the contact.
-	</tp:docstring>
-      </arg>
-      <arg name="number" type="s" direction="out">
-	<tp:docstring>
-	  The number of the contact.
+	  The contact structure containing index, name, and number.
 	</tp:docstring>
       </arg>
     </method>
diff --git a/introspection/mm-modem-gsm-network.xml b/introspection/mm-modem-gsm-network.xml
index 10215ccf..83a14688 100644
--- a/introspection/mm-modem-gsm-network.xml
+++ b/introspection/mm-modem-gsm-network.xml
@@ -112,19 +112,12 @@
       </tp:docstring>
       <annotation name="org.freedesktop.DBus.GLib.Async" value=""/>
       <annotation name="org.freedesktop.DBus.GLib.CSymbol" value="impl_gsm_modem_get_reg_info"/>
-      <arg name="status" type="u" direction="out" tp:type="MM_MODEM_GSM_NETWORK_REG_STATUS">
+      <arg name="info" type="(uss)" direction="out">
 	<tp:docstring>
-	  The network status.
-	</tp:docstring>
-      </arg>
-      <arg name="operator_code" type="s" direction="out">
-	<tp:docstring>
-	  The current operator code.
-	</tp:docstring>
-      </arg>
-      <arg name="operator_name" type="s" direction="out">
-	<tp:docstring>
-	  The current operator name.
+	  The returned information contains:
+	    * Network status.
+	    * Current operator code.
+	    * Current operator name,
 	</tp:docstring>
       </arg>
     </method>
diff --git a/introspection/mm-modem-gsm-sms.xml b/introspection/mm-modem-gsm-sms.xml
index 4f7acd0c..e710c166 100644
--- a/introspection/mm-modem-gsm-sms.xml
+++ b/introspection/mm-modem-gsm-sms.xml
@@ -26,24 +26,9 @@
 	  The index of the SMS.
 	</tp:docstring>
       </arg>
-      <arg name="found_index" type="u" direction="out">
+      <arg name="sms" type="(ussd)" direction="out">
 	<tp:docstring>
-	  The index of the SMS (same as the passed index).
-	</tp:docstring>
-      </arg>
-      <arg name="number" type="s" direction="out">
-	<tp:docstring>
-	  The number the SMS was received from.
-	</tp:docstring>
-      </arg>
-      <arg name="contents" type="s" direction="out">
-	<tp:docstring>
-	  The contents of the SMS.
-	</tp:docstring>
-      </arg>
-      <arg name="time" type="d" direction="out">
-	<tp:docstring>
-	  The timestamp.
+	  The SMS structure containing index, number, contents and time stamp.
 	</tp:docstring>
       </arg>
     </method>
diff --git a/src/mm-modem-gsm-card.c b/src/mm-modem-gsm-card.c
index ffe4f2eb..85385b25 100644
--- a/src/mm-modem-gsm-card.c
+++ b/src/mm-modem-gsm-card.c
@@ -75,8 +75,32 @@ info_call_done (MMModemGsmCard *self,
 
     if (error)
         dbus_g_method_return_error (context, error);
-    else
-        dbus_g_method_return (context, manufacturer, model, version);
+    else {
+        GValueArray *array;
+        GValue value = { 0, };
+
+        array = g_value_array_new (3);
+
+        /* Manufacturer */
+        g_value_init (&value, G_TYPE_STRING);
+        g_value_set_string (&value, manufacturer);
+        g_value_array_append (array, &value);
+        g_value_unset (&value);
+
+        /* Model */
+        g_value_init (&value, G_TYPE_STRING);
+        g_value_set_string (&value, model);
+        g_value_array_append (array, &value);
+        g_value_unset (&value);
+
+        /* Version */
+        g_value_init (&value, G_TYPE_STRING);
+        g_value_set_string (&value, version);
+        g_value_array_append (array, &value);
+        g_value_unset (&value);
+
+        dbus_g_method_return (context, array);
+    }
 }
 
 static void
diff --git a/src/mm-modem-gsm-network.c b/src/mm-modem-gsm-network.c
index c49aff4b..c302dead 100644
--- a/src/mm-modem-gsm-network.c
+++ b/src/mm-modem-gsm-network.c
@@ -116,9 +116,30 @@ reg_info_call_done (MMModemGsmNetwork *self,
     if (error)
         dbus_g_method_return_error (context, error);
     else {
-        dbus_g_method_return (context, status, 
-                              oper_code ? oper_code : "",
-                              oper_name ? oper_name : "");
+        GValueArray *array;
+        GValue value = { 0, };
+
+        array = g_value_array_new (3);
+
+        /* Status */
+        g_value_init (&value, G_TYPE_UINT);
+        g_value_set_uint (&value, (guint32) status);
+        g_value_array_append (array, &value);
+        g_value_unset (&value);
+
+        /* Operator code */
+        g_value_init (&value, G_TYPE_STRING);
+        g_value_set_string (&value, oper_code);
+        g_value_array_append (array, &value);
+        g_value_unset (&value);
+
+        /* Operator name */
+        g_value_init (&value, G_TYPE_STRING);
+        g_value_set_string (&value, oper_name);
+        g_value_array_append (array, &value);
+        g_value_unset (&value);
+
+        dbus_g_method_return (context, array);
     }
 }
 
@@ -330,7 +351,9 @@ mm_modem_gsm_network_registration_info (MMModemGsmNetwork *self,
 {
     g_return_if_fail (MM_IS_MODEM_GSM_NETWORK (self));
 
-    g_signal_emit (self, signals[REGISTRATION_INFO], 0, status, oper_code, oper_name);
+    g_signal_emit (self, signals[REGISTRATION_INFO], 0, status,
+                   oper_code ? oper_code : "",
+                   oper_name ? oper_name : "");
 }
 
 void