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Enable update checkout on change for specific checkout fields in WooCommerce

Solution:

That is very simeple as you will see… It can be done just adding 'update_totals_on_change' to billing email and phone fields wrapper class, this way:

add_filter( 'woocommerce_checkout_fields' , 'trigger_update_checkout_on_change' );
function trigger_update_checkout_on_change( $fields ) {

    $fields['billing']['billing_phone']['class'][] = 'update_totals_on_change';
    $fields['billing']['billing_email']['class'][] = 'update_totals_on_change';

    return $fields;
}

Code goes in functions.php file of your active child theme (or active theme). Tested and works.

But sometimes depending on your code, it will be not enough.