Because we all have cell phones now, and everyone's number programmed into our contacts, it hardly matters what number someone has. It isn't so strange to not know the number of someone in your family, including your spouse. In this way, area codes are increasingly irrelevant and we move closer and closer to simply a 10-digit phone number that has no geographical significance.
Then, a number pops up on your cell phone and you wonder "3-1-4 Who do I know from that area code? What area code is it." A quick Google search and suddenly you are reminded that you dear friend is originally from Missouri. Roots. Connections. We are not entirely done with our old ways. Just re-discovering them.