I am trying to implement a wap-based city navigation/routing service. So far I downloaded "Capitalizing On The Location-Based Services Opportunity" from this site. As far as I understood - all the 3 types of positioning are sort of "client side" and limited to just a subset of mobile devices. Is it possible to to identify/access client's position data using cell-based positioning method directly from a server-side application e.g. by quering a database or device on the side of mobile communication provider? Or is it the only possibility to get coordinates from user's device? Are those coordinates assigned to special environmental variables, so that I could "take them" automatically without forcing users "dialing" them manually into a form? If so, how can I access those variables?