assets/carrier_config_23415.xml

<?xml version='1.0' encoding='utf-8' standalone='yes' ?>
<carrier_config_list>
    <carrier_config>
        <int name="smsToMmsTextThreshold" value="10" />
        <string name="default_vm_number_string">121</string>
        <string-array name="read_only_apn_types_string_array" num="1">
            <item value="*" />
        </string-array>
    </carrier_config>
</carrier_config_list>