If you are looking to add a new line, you will have to wait for Verizon to up its server capacity or hope things go back online when demand dies down at some point in the day. If you want to upgrade your current line, then point your browser to Apple's website. Apple is taking pre-orders today, and its site is still online. So, Verizon customers, what are you waiting for? Go, go, go and grab yourself an iPhone 4.
[Via Business Insider]