I Created a event
with observer
. Here is the Code:
<frontend>
<events>
<checkout_cart_save_before>
<observers>
<your_module_shipping_observer>
<type>singleton</type>
<class>Your_Module/observer</class>
<method>setFreeShipping</method>
</your_module_shipping_observer>
</observers>
</checkout_cart_save_before>
</events>
</frontend>
Observer function setFreeShipping
Code:
public function setFreeShipping($observer) {
$event = $observer->getEvent();
$cart = $event->getCart();
$shippingaddress = $cart->getQuote()->getShippingAddress();
$shippingaddress->setShippingMethod('')->save();
return;
}
Reference and credits: link