1. A system for distributed policy services for mobile and nomadic networking, the system comprising: a plurality of policy function entities, the plurality including an anchor policy function entity and a serving policy function entity; and a policy router for receiving and routing policy-related signaling messages to policy functions, wherein the anchor policy function is configured to make policy decisions in response to receiving an application request from a subscriber terminal equipment, wherein the serving policy function entity is configured to be associated with the subscriber while the subscriber is accessing a visited network, to learn topology information comprising an identifier of the subscriber terminal equipment being associated with a network address of an enforcement device to which the subscriber is currently associated, to provide the learned topology information to the policy router, and to control the enforcement device to enforce the set of policy decisions, wherein the policy router is configured to receive a policy-related request associated with the subscriber, select an anchor policy function based on the learned network topology or subscriber location, and route the received request to the selected anchor policy function.