When I said "phone number," I wasn't implying any portability. I was actually thinking of a land-line phone number. The point I was making is that it's assumed

When I said "phone number," I wasn't implying any portability. I was actually thinking of a land-line phone number. The point I was making is that it's assumed you can get a static phone number for your house, but most of the public don't know how to get a static IP address for their house (and it's often not even possible to do, depending on ISP).