That was at the core of the "locationgate" a few years ago because location of surrounding access point wasn't flushed enough regularly. Hence revealing approximate location to people that can materially access the phone (this was before iOS full disk encryption). See: http://allthingsd.com/20110427/apple-breaks-its-silence-on-l...

And by today standard I really appreciate Apple approach of doing most of the computation on the phone itself.