When Verizon customers order FiOS, they get attached to a proprietary network and get (more or less permanently) removed from the open-access network.

Verizon's new high-bandwidth fiber lines are fully capable of carrying not only calls but also Internet data and television with room to grow. But once the copper is pulled, it's difficult to switch back to the traditional phone system or less expensive Digital Subscriber Line service. And Verizon isn't required, in most instances, to lease fiber to rival phone companies, as it is with the copper infrastructure.

Once You Go Optical, There's No Going Back -- No, Really