The overall goal of the Ambient Networks Integrated Project is to develop a vision for future wireless and mobile networks. Even though mobility management has been investigated within numerous research and standardisation projects, the novel approach of Ambient Networks on the distribution of control space functions brings up possibilities to tailor mobility support for specific environments such as 3GPP and IEEE802 networks and on the other hand to efficiently manage the large variety of co-existing legacy and novel solutions foreseen in beyond 3G networks. The paper describes how modular design of mobility management functions can contribute to this objective. A topic, which is very much related to modularity deals with different types of communication endpoints. The paper elucidates how this discussion will help to coordinate different mobility solutions residing at different layers of the communication stack.