I don't understand one point: how can you order a pizza without giving your address (which is apparently what the article is describing)? Is this something spe

I don't understand one point: how can you order a pizza without giving your address (which is apparently what the article is describing)? Is this something specific to the USA? Perhaps in the US there is a way for the pizza shop to retrieve an address from a phone number? Also, the pizza shop is probably using a landline phone, how are they going to know the caller's number? I know that some landline phones are supposed to show the caller's number on a display, but in my experience (Italy, Australia) that feature doesn't work half of the times. Do you folks in the US have a more reliable system?