Apple's latest mobile operating system adds 200 new functions and upgrades, including call-management features that let you blacklist callers and send canned text messages when you're not available; FaceTime video-calling over mobile networks; and a more useful version of the Siri personal assistant app. The most notable change, however, is Apple's new Maps app, which replaces the Google Maps app that was part of earlier versions of iOS. For the first time iOS has built-in turn-by-turn navigation, and it includes a slick "flyover" feature that lets you zoom in on certain locations using aerial photos. However, Maps is a decidedly mixed bag, as iOS 6 loses Google's helpful Street View, along with its mass-transit directions, and Maps' Yelp-driven point-of-interest data is not nearly as robust as Google Maps' data.