Magento 2 New Order Event: get Customer's telephone

Question

I have an observer for every order status change, and another for every new order. In both observers I need to retrieve the customer's phone number. In order-status-change this happens as follows:

$phone = $order->getBillingAddress()->getTelephone();

However in new-order, none of the below succeed. They all return null. Why does this happen? What could I do?

$order->getCustomerPhone();
$order->getBillingAddress();
$order->getShippingAddress();
$order->getPrimaryBillingAddress();

Answer 1

You can use the event <event name="sales_order_address_save_after"> in which order id already stored (if you need it). Just check is it billing or shipping address:

$event = $observer->getEvent();
/** @see \Magento\Framework\Model\AbstractModel::_getEventData() */
/** @var \Magento\Sales\Model\Order\Address $address */
$address = $event->getDataObject();
/** @var int $orderId */
$orderId = $address->getParentId();
$addressType = $address->getAddressType();

switch ($addressType) {
    case Address::TYPE_BILLING:
        // Do something with billing address
        break;
    case Address::TYPE_SHIPPING:
        // Do something with shipping address
        break;
    default:
        /**
         * This is a not usual case, when address type is not in one of this types: billing or shipping
         */
        break;
}

this event is triggered each time order address was saved. So you should add an additional check: is your info (telephone) was already stored recently or not?

Answer 2

I found a trick that worked. (The event remained unchanged: sales_order_save_after)

private function getPhoneFromObserver(Observer $observer)
{
    $data = $observer->getEvent()->getOrder();
    foreach( $data['addresses'] as $addr ) {
        if( $addr['telephone'] !== null ) {
            return $addr['telephone'];
        }
    }
    return null;
}