Buried inside System Preferences on your iOS device is a list of places you frequently go--with a surprisingly useful (or creepy) amount of data. Here's how to find it.
Both iOS 7 and Android (via Google Now) are constantly logging all your locations as a first step in offering useful contextual information about your surroundings. And while it may still seem a bit high on the creepy scale, it can also be really useful to have access to the same location information your phone does.