Abstract: A method and a device is described for determining the physical location and/or identity of network users and for preventing certain undesired users for participating in—or getting access to restricted activities, services or information. When a user accesses a service provider's website, an encrypted session ID is stored on the user's electronic device or computer. The user's electronic device or computer is then coupled to the service provider's server through a phone connection and the session ID is transferred to the service provider over the phone line for verification. By using Caller ID technology the user's telephone number is identified, and by analyzing the phone number the location of the player is determined. If the location satisfied the service provider's and any official regulator's requirements the available service options are then determined depending on the user's specific location.