Google Maps for iPhone is out, and it’s a solid replacement for Apple’s Maps app in iOS 6. Jailbreakers can make Google Maps the default maps app on their iPhones, but everyone else has to deal with the fact that Apple will never let you fully replace its own Maps with Google’s. It’s a shame, but it’s the walled iOS garden we all live in.
That doesn’t mean you can’t use Siri to get directions with Google Maps, however. You don’t even need to jailbreak. There’s a simple trick that makes it possible.