Make Woocommerce checkout phone field optional based on shipping country

Question

In Woocommerce checkout, I am trying to make the phone field not required for specific shipping countries. Based on \"Make checkout phone field optional for specific cou

Answer 1

Huge thanks to @LoicTheAztec for the original answer, however the solution now gives erratic results and just alternately switches the phone field between required and optional states (on / off).

The original answer also does not take into account customers who are using the billing address only and have not entered a separate delivery or shipping address.

Please see the updated version below for 2019

// SETTINGS: The countries codes (2 capital letters) in the array
function defined_countries_for_phone_field(){
    return array( 'GB', 'JE', 'GG', 'IM' );
}

// Remove "(optional)" from non required "Billing phone" field
add_filter( 'woocommerce_form_field' , 'remove_checkout_optional_fields_label', 10, 4 );
function remove_checkout_optional_fields_label( $field, $key, $args, $value ) {

    // Get the defined countries codes
    $countries = defined_countries_for_phone_field();

    // Get Customer shipping country
    $shipping_country = WC()->customer->get_shipping_country();

    // Only on checkout page and My account > Edit address for billing phone field
    if( 'billing_phone' === $key && ( ( is_wc_endpoint_url( 'edit-address' )
    && in_array($shipping_country, $countries) ) || is_checkout() ) ) {
        $optional = ' (' . esc_html__( 'optional', 'woocommerce' ) . ')';
        $field = str_replace( $optional, '', $field );
    }
    return $field;
}

// Make the billing phone field optional (by default)
add_filter( 'woocommerce_billing_fields', 'filter_billing_phone_field', 10, 1 );
function filter_billing_phone_field( $fields ) {

    // Get the defined countries codes
    $countries = defined_countries_for_phone_field();

    // Get Customer shipping country
    $shipping_country = WC()->customer->get_shipping_country();

    // Only on checkout page and My account > Edit address
    if ( ( is_wc_endpoint_url( 'edit-address' )
    && in_array($shipping_country, $countries) ) || is_checkout() )
        $fields['billing_phone']['required'] = false;

    return $fields;
}

// Real time shipping country selection actions
add_action( 'woocommerce_after_order_notes', 'custom_checkout_scripts_and_fields', 10, 1 );
function custom_checkout_scripts_and_fields( $checkout ) {
    $required = esc_attr__( 'required', 'woocommerce' );

    // Get the defined countries codes
    $countries = defined_countries_for_phone_field();

    // Hidden field for the phone number validation
    echo '';
    $countries_str = "'".implode( "', '", $countries )."'"; // Formatting countries for jQuery
    ?>