Explore the world of femtocells in this TROOPERS11 conference talk. Delve into the history of telecommunications and UMTS architecture before focusing on femtocell technology, its advantages, and implementation. Learn about femtocell hardware, security measures, and recovery procedures. Discover how to detect and potentially circumvent femtocell detection methods. Examine the Femtostep architecture, its location capabilities, and privacy implications. Investigate possible attacks on femtocell systems and draw key conclusions about this emerging technology in mobile networks.