I dunno.. I suspect that this won't really be used and that someone can still find you or find ways to bypass the software.

Now that wireless companies can track a mobile phone's location, customers will want to control exactly who knows where they are and when.

Bell Labs says it has developed a network software engine that can let cell users be as picky as they choose about disclosing their whereabouts, a step that may help wireless companies introduce "location-based services" in a way customers will find handy rather than intrusive.

In a presentation this week at an industry conference, researchers for the Bell Labs division of Lucent Technologies Inc. plan to describe how their technology copes with the conflicting demands of speed, privacy and personalization on a live telephone network -- enabling users to specify what location information is shared, when, with whom, how and under what circumstances.

While one U.S. mobile phone operator, AT&T Wireless, already offers a "Find Friends" feature that's somewhat analogous to a buddy list in instant messaging, location-based services have mostly remained an unfulfilled promise.

More recently, under a federal mandate requiring that cell carriers be able to pinpoint the whereabouts of any customer who calls 911 during an emergency, expensive network upgrades have made wireless companies more anxious to deploy services which can exploit these new capabilities for a profit.

Examples of such services would typically include the ability for restaurants and other businesses to send a solicitation by text message to a cell phone when its owner wanders within range of those merchants. Other applications might include the ability to locate co-workers and customers.
Read the full article at CNN