Customer Phone – How to Get Customer Phone from Order Shipping Data

Let's say that you have the order id 10000015: So

$orderId = '10000015';
$order = Mage::getModel('sales/order')->loadByIncrementId($orderId);
$billingAddress = $order->getBillingAddress();
$shippingAddress = $order->getShippingAddress();

You can't get product id like this $observer->getEvent()->getProduct()->getId();

This is order event not product event

 public function execute(\Magento\Framework\Event\Observer $observer)
{
 $order = $observer->getEvent()->getOrder();
 $order_id = $order->getIncrementId();
 $this->_logger->info($order_id);   
 foreach($order->getAllItems() as $item){
      $ProdustIds[]= $item->getProductId();

     $proName[] = $item->getName(); // product name
 }
 $this->logger->info($ProdustIds);
 $shippingAddress = $order->getShippingAddress(); // shipping address
 $customer = $order->getCustomerId(); // using this id you can get customer name
} 

And for phone number you can get from shipping address or using customer id