PHONE NUMBER OR EMAIL NOT REQUIRED

 // For billing email and phone - Make them not required

add_filter( 'woocommerce_billing_fields', 'filter_billing_fields', 20, 1 );
function filter_billing_fields( $billing_fields ) {
    // Only on checkout page
    if( ! is_checkout() ) return $billing_fields;

    $billing_fields['billing_phone']['required'] = false;
    $billing_fields['billing_email']['required'] = false;
    return $billing_fields;
}