void custom_sms_delete_message_callback(vm_gsm_sms_callback_t* callback_data)
{
    if(callback_data->action == VM_GSM_SMS_ACTION_DELETE)
    {
        if(callback_data->cause == VM_GSM_SMS_CAUSE_NO_ERROR)
        {
            if(!callback_data->action_data)
            {
                 vm_log_debug("action_data is NULL.");
                 return;
            }
            vm_log_debug("delete message success, result = %d, cause = %d",
                         callback_data->result, callback_data->cause);
        }
        else
        {
            vm_log_debug("delete message failed.");
        }
    }
}

void custom_sms_delete_message(void)
{
    VMINT16 message_id;
    VMINT res;

    message_id = vm_gsm_sms_get_message_id(VM_GSM_SMS_BOX_INBOX, 0);
    if(message_id == -1)
    {
        vm_log_debug("custom_sms_delete_message 0 message-index does not exist.");
    }
    res = vm_gsm_sms_delete_message(message_id, custom_sms_delete_message_callback, NULL);
    if(res != VM_GSM_SMS_RESULT_OK)
    {
        vm_log_debug("custom_sms_delete_message delete message failed.");
    }
}