Why isn't the customer's phone number showing up in the packing slip?

I am having some issues with having the customers phone number show up in the packing slip. Client prints it out for all orders: POS and online (POS is more of a phone call or someone comes in, then they ship or customer returns later for items once made/assembled).

In settings we have selected that you have to input your phone number on checkout, but I can not seem to call on it for POS orders, only online orders.

I then tried to just call on the client’s phone number from their profile with no luck.

{{ shipping_address.phone }} will call on the phone number for online orders only for us (makes sense)

{{ customer.phone }} doesn’t give me anything??

By this logic, does that mean that the shipping address phone number doesn’t get added to the clients profile? Should client use a different field for phone number for POS orders?

Any ideas?

For those having issues with this and find this, {{ customer.phone }} does not work for packing slips.

I have made this work so far though, so that it looks for a billing phone number (from online orders), then if the phone was added to the customer profile, and if that is blank will add it from the shipping address:

Phone: {% if billing_address.phone == blank %} {{ order.customer.phone }} {% elsif order.customer.phone == blank %} {{ billing_address.phone }} {% else %} {{ shipping_address.phone }} {% endif %}

How do I use this code? Where it has to be inserted? I am a complete noob. My whatsapp automation does not work because of this issue.