Architecture that facilitates the validation and authentication of the physical location of the dual-mode handset in a VoWLAN solution (e.g., UMA (Unlicensed Mobile Access)) system and a cellular wireless service, thereby restricting the handset from gaining access from unauthorized locations. Thus, access to dual-mode service (e.g., UMA), for example, at a particular location (e.g., in a subscriber's home, or in a hot spot that is controlled by carrier) can now be managed to allow or deny service at a certain location. Another aspect of the invention is the capability to perform location-based billing. For example, if the subscriber is at home, the call may be free. Alternatively, if the subscriber is at a remote location (e.g., a retail establishment), it is now possible to charge for that connection at a different fee. Additionally, a location can now be assigned; for example, to assign a location for E911 compliance.