res/xml/gsm_umts_call_options.xml

<?xml version="1.0" encoding="utf-8"?>

<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:phone="http://schemas.android.com/apk/res/com.android.phone"
     android:title="@string/labelGSMMore">

    <PreferenceScreen
        android:key="call_forwarding_key"
        android:title="@string/labelCF"
        android:persistent="false" />

    <PreferenceScreen
        android:key="additional_gsm_call_settings_key"
        android:title="@string/additional_gsm_call_settings"
        android:persistent="false" />

</PreferenceScreen>