To create shipments, you must specify the buyer's phone number. In order not to waste time on personal clarification of additional information, it is possible to create a personalization of goods to request a phone number.
How to do it? In the listing, enable the personalization option, add the appropriate text asking for a phone number and click Publish.
If the product that you sell requires its own personalization, you can ask, along with the personalization, to indicate the phone number or add a request to the messages the buyer receives after placing the order.