In today's world as the internet users become more mobile, hence the need for location determination is a key need to provide services based on location, but many devices do not have GPS receivers or transmitters, hence the location determination of these devices is important to provide the location based services, like Advertisements, security, so forth. Location determination of mobile devices has been there for some time but most approaches are based on client intervention, so they are not suitable for integrating in security related components like intrusion detection systems or access control systems. In this paper we propose an approach based on that works on concept of trilateration to determine client location without his/her intervention.