Search in iOS is about to go a lot deeper, as Apple's Craig Federighi spoke onstage at WWDC 2015 about how this feature would be drastically expanded. Users will be able to search email to identify who is calling. Search in iOS 9 will be able to surface app content. Search will become much, much more useful in iOS 9 - offline and online - in the near future. This search expansion will start with iOS, but will likely expand on OS X and Watch OS in the near future.