For instance, a classic example would be the ability of a mobile cellular phone to switch to WiFi VoIP— mid-call — when it discovers a valid network to use. In this scenario, your mobile phone would dynamically move your existing call over the cellular network to a valid WiFi network (for example, your home wireless network) when you came into range, saving your cellular airtime and providing additional bandwidth for data communications. If you had IMS-enabled phones attached to your landline carrier, you could transfer a call from your IMS-enabled cellular phone to your home phone or VoIP soft-phone on your laptop while travelling, transferring the call across service providers (SP) without dropping it. IMS, when fully deployed, will enable you to choose a SP not by the quality or ubiquity of their network, but by the services they offer. These services would be available to all your IMS-enabled devices (cable set-top boxes, computers, landline phones, mobile phones, and more). The “network,” or how you connect to those services, will become irrelevant
