ABSTRACT
Location-based services (LBSs) use the power of mobile networks to locate users and provide services specific to their current location. Imagine
∙ You are about to call your boss, but when you highlight her name in your address book, you see that she is currently in a different time zone where it is the middle of the night. You decide to leave her a voicemail instead.
∙ You are in a crowded theater and your phone automatically silences itself for all but the most urgent calls.
