Then just don't put in the phone number. I asked for a pack and left the number blank. As an FYI many shippers like FedEx ad UPS ask for phone numbers for delivery purposes. That is what the number would be used for. But there is no obligation to provide a number.
http://moabpaper.com/luminous-landscape/ This link asks for but does not require phone number. If nothing else just put in a random 10 digit number.