Location-aware smartphones support various location-based services (LBSs): users query the LBS server and learn on the fly about their surroundings. Our solution does not require changing the LBS server architecture and does not assume third party servers; yet, it significantly improves users’ location privacy. The gain stems from the collaboration of mobile devices: they keep their context information in a buffer and pass it to others seeking such information. Our simulations with real mobility traces corroborate our model-based findings. Finally, our implementation on POI platforms indicates that it is lightweight and the cost of collaboration is negligible. Secure Computing provides, a global leader in enterprise security solutions. Secure Computing’s award-winning solutions, powered by Trusted Source technology, proactively protect mission-critical business applications from Internet-borne threats. Such inquiry give away private data, permitting the LBS to track users. Introduces a user-collaborative privacy-serving access for LBSs.