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 add_action('woocommerce_new_order', 'webexpert_woocommerce_send_sms');

 function webexpert_woocommerce_send_sms($order_id)
    {
        $order = wc_get_order($order_id);
        $phone = $order->get_billing_phone();
        if ($order) {
            webexpert_woocommerce_send_sms("ΝΕΑ ΠΑΡΑΓΓΕΛΙΑ #{$order_id}αξίας " . $order->get_total() . ". Σας ευχαριστούμε!", $phone);
        }
        return $order_id;
    }